Toyota GR86 Forum - GT86 Forum, Subaru BRZ Forum, Scion ... banner

Fuel Consumption

7731 Views 82 Replies 27 Participants Last post by  Mcgiiver
Hey everyone,

I just wanted to check in and see if anyone has had the situation where the fuel consumption fluctuates.

Not sure if it has to do with the quality of gas or if its something else.
It has happened more frequently in this colder weather.

Here in AZ we get 91 octane and I fill up before going to work, (20 mile drive). Usually I go through one fuel bar to and from work with normal driving. Today I fueled up and went through one bar just to work. WTH? LOL

To me it seems that the fuel usage varies quite a bit.
  • Like
Reactions: 1
61 - 80 of 83 Posts
dang..

mostly city driving?
I
yea, probably about 85% city on that tank full - the car is listed at 20 mpg city so I guess its not far off. I think I'm averaging about 22 mpg over 8500 miles
yea, probably about 85% city on that tank full - the car is listed at 20 mpg city so I guess its not far off. I think I'm averaging about 22 mpg over 8500 miles
interesting..
I did quite a bit of driving this past weekend (city) running errands and such.

since most of my driving is highway, (to and from work) the consumption is ok. 'but damn, I went through half a tank in two days Saturday/sunday lol.
Besides those who are mixing E85 and 91 octane, has anyone added octane boost?

Asking for those who don't have access to octane over 91.
I was concerned about gas mileage so I finally got around to checking it myself. Turns out it’s close to what I have been hearing, 22.4/gallon. I have a base with a manual. I rarely pout my foot into it. I also use cruise control even when not on the highway. Except when I am on the interstate I rarely get it much above 3000rpm.

One question I have. Should I be using 6th gear when driving around town at speeds under 50mph? or would it be better to leave it in 5th?
  • Like
Reactions: 1
I was concerned about gas mileage so I finally got around to checking it myself. Turns out it’s close to what I have been hearing, 22.4/gallon. I have a base with a manual. I rarely pout my foot into it. I also use cruise control even when not on the highway. Except when I am on the interstate I rarely get it much above 3000rpm.

One question I have. Should I be using 6th gear when driving around town at speeds under 50mph? or would it be better to leave it in 5th?
I gotta say, 22 mpg seems low to me if you rarely put your foot into it and do highway driving with cruise and RPMs rarely over 3000. To me that says high 20s, or mid 20s if a bit more city than highway. I haven't kept the best track of mine but def had tanks around 18 with aggressive driving and around 22 with a mix of that and easy highway. I've seen a reported 30-ish on easy highway stints (note, the computer does lie) but that's been so little of my driving my overall average is prob around 20/21.

I think you can do 6th gear in the upper 40 MPHs. There's a chart somewhere on the forum that will tell you. It would be a dog to accelerate but not a prob so long as you don't lug the engine. So I wouldn't cruise at much below 2K RPM.
I don't know how your mileage is that bad. I get 30 without trying on the highway plus some full throttle accelerations and traffic. If I could manage to old-man a highway run only, I'd probably be around 34 and that's calculated, not going by the computer.
  • Like
Reactions: 2
I don't know how your mileage is that bad. I get 30 without trying on the highway plus some full throttle accelerations and traffic. If I could manage to old-man a highway run only, I'd probably be around 34 and that's calculated, not going by the computer.
I don't know how @Boomer2677 only gets 22 OR how YOU get 30 on the highway without trying and think you'd get 34 by babying it! :LOL:

What's your actual average overall, and what's your mix of easy highway vs hard/city driving??
I don't know how your mileage is that bad. I get 30 without trying on the highway plus some full throttle accelerations and traffic. If I could manage to old-man a highway run only, I'd probably be around 34 and that's calculated, not going by the computer.
you will always get better mileage on the highway, especially if you use cruise control.

I would say if you do city driving with stop and go traffic, you can get around 25mpg. unless you are heavy on the pedal, 21/22mpg? anything lower is just crazy.
So i bought this economy sports car and i want more gas mileages, what is best technique for hyper trolling ?
  • Haha
Reactions: 4
unless you are heavy on the pedal, 21/22mpg? anything lower is just crazy.
You too can achieve 18 MPG. Just drive like me!
Averaging right around 30mpg combined, running E85/ethanol free 91 blend. Approx 50/50 mix of highway and spirited country road driving.

I find it hard to fathom low 20s unless you’re driving like an absolute jackass 24/7.
  • Like
Reactions: 1
Averaging right around 30mpg combined, running E85/ethanol free 91 blend. Approx 50/50 mix of highway and spirited country road driving.

I find it hard to fathom low 20s unless you’re driving like an absolute jackass 24/7.
For crying out loud, even the EPA has a city number of just 20 MPG on the MT cars and 27 on the highway. Plus 22 Combined. So be real. It's super nice that you get to spend most of your miles on country roads and the highway -- I'm green with envy -- but that's hardly the norm. See EPA numbers, ahem.

Spirited country road driving is not gonna consume a lot of gas. Country roads likely to give even better mileage than highway speeds, espec the way the MT is geared, with high-ish RPMs even in 6th gear. And your other half is highway. I can def see high 20s doing that combination.

Also, remember that the computer is optimistic by about 1.5 MPG.

If you're stuck in a densely populated area with lots of stop lights etc., believe me you are going to get bad mileage. Especially if you're trying to have some fun under those conditions. And on the little highway I do in my area, you're going 75 much of the time just to avoid being one of the slower drivers.

So, yes, low 20s is very easy under those conditions. And 18 is not hard either. And, er, again -- the EPA numbers.

I should have known better than to engage in this topic. There's always some guy who saw his computer report 38 for 5 seconds and then tells everyone that's what he gets on the highway...
See less See more
  • Like
Reactions: 2
I have posted this multiple times, so in brief: I have never gotten below 26 even on winter fuel, though that was helped by taller winter tires. I never use cruise control—it is less efficient as it slows the car on declines when it should be coasting or speeding up and even “smart” cruise doesn’t see beyond the car directly in front to anticipate what’s beyond. I have always beaten EPA numbers in every car. I drive in and around Boston, known for some of the worst traffic in the country, though I don’t have to drive I93 south of the I95 interchange as often anymore (but even when I did, I had my Focus ST and got about the same mileage, which I did consistently in similar conditions to the GR that gets about 1 mpg better), I’m on I95 and I495 a lot. At 75mph, I get around 29. I still average around 29 from a tank with runs to 90+ when I’m on 495 because if there’s not stop-and-go traffic, the morning choices are 55-60 behind a truck or 90+ to keep out of the way of weaving Altimas with 4 different colored body panels rolling on a skinny.

Back off the throttle to the minimum it takes to hold speed, anticipate traffic flow—don’t tailgate and coast to stops you can see up ahead. You’re stuck in lanes of traffic, why not drive to save fuel? It also makes traffic less annoying in a manual. I don’t have to constantly shift like people complain about because I pay attention to the flow. This isn’t hypermiling leading a parade like a Prius ca. 2008. I do not have people constantly cutting me off even with our “crazy” Boston drivers and anyone who might ride my ass is the kind that does that to everyone. I have averaged 33mpg with some city driving mixed in. 34 would definitely be possible. Someone else on here has gotten even better than that.

In WW2, Charles Lindbergh finally found where he left his balls and decided to help the war effort by going to the Pacific to teach the fighter pilots how to maximize range by adjusting throttle and prop pitch settings to reduce engine load and drag. They lost less people to running out of fuel after that and I’m sure it gave guys the confidence to stay in a fight longer. I’m not flying a Corsair, but I tried out the idea of keeping engine load down when cruising and—surprise!—it works. Also better for the engine as long as you’re not lugging it—keep revs over 2k and downshift to accelerate or at least accelerate with a light throttle from that engine speed in higher gears. Load=HP=fuel use.
See less See more
  • Like
Reactions: 1
I have posted this multiple times, so in brief: I have never gotten below 26 even on winter fuel, though that was helped by taller winter tires. I never use cruise control—it is less efficient as it slows the car on declines when it should be coasting or speeding up and even “smart” cruise doesn’t see beyond the car directly in front to anticipate what’s beyond. I have always beaten EPA numbers in every car. I drive in and around Boston, known for some of the worst traffic in the country, though I don’t have to drive I93 south of the I95 interchange as often anymore (but even when I did, I had my Focus ST and got about the same mileage, which I did consistently in similar conditions to the GR that gets about 1 mpg better), I’m on I95 and I495 a lot. At 75mph, I get around 29. I still average around 29 from a tank with runs to 90+ when I’m on 495 because if there’s not stop-and-go traffic, the morning choices are 55-60 behind a truck or 90+ to keep out of the way of weaving Altimas with 4 different colored body panels rolling on a skinny.

Back off the throttle to the minimum it takes to hold speed, anticipate traffic flow—don’t tailgate and coast to stops you can see up ahead. You’re stuck in lanes of traffic, why not drive to save fuel? It also makes traffic less annoying in a manual. I don’t have to constantly shift like people complain about because I pay attention to the flow. This isn’t hypermiling leading a parade like a Prius ca. 2008. I do not have people constantly cutting me off even with our “crazy” Boston drivers and anyone who might ride my ass is the kind that does that to everyone. I have averaged 33mpg with some city driving mixed in. 34 would definitely be possible. Someone else on here has gotten even better than that.

In WW2, Charles Lindbergh finally found where he left his balls and decided to help the war effort by going to the Pacific to teach the fighter pilots how to maximize range by adjusting throttle and prop pitch settings to reduce engine load and drag. They lost less people to running out of fuel after that and I’m sure it gave guys the confidence to stay in a fight longer. I’m not flying a Corsair, but I tried out the idea of keeping engine load down when cruising and—surprise!—it works. Also better for the engine as long as you’re not lugging it—keep revs over 2k and downshift to accelerate or at least accelerate with a light throttle from that engine speed in higher gears. Load=HP=fuel use.
I think most people know how to drive to maximize MPG. I do that in my 4Runner, where I've many times beaten the EPA number on trips of hundreds of miles. It's not something I'm interested in doing in this car. If I'm averaging high 20s / low 30s then I'm not using the car for what I got it for. It would have much less reason to be in my garage.

I haven't been complaining about the MPG I'm getting. The issue I have is people throwing shade at those who are getting 20 MPG, as if that's hard to even conceive. Please. There's a reason the EPA number is 20 in the city and 22 combined. And the EPA test is not based on regularly winding the car out to redline.

People peacocking about what great gas mileage they get in a sports car? Weird.
For crying out loud, even the EPA has a city number of just 20 MPG on the MT cars and 27 on the highway. Plus 22 Combined. So be real. It's super nice that you get to spend most of your miles on country roads and the highway -- I'm green with envy -- but that's hardly the norm. See EPA numbers, ahem.

Spirited country road driving is not gonna consume a lot of gas. Country roads likely to give even better mileage than highway speeds, espec the way the MT is geared, with high-ish RPMs even in 6th gear. And your other half is highway. I can def see high 20s doing that combination.

Also, remember that the computer is optimistic by about 1.5 MPG.

If you're stuck in a densely populated area with lots of stop lights etc., believe me you are going to get bad mileage. Especially if you're trying to have some fun under those conditions. And on the little highway I do in my area, you're going 75 much of the time just to avoid being one of the slower drivers.

So, yes, low 20s is very easy under those conditions. And 18 is not hard either. And, er, again -- the EPA numbers.

I should have known better than to engage in this topic. There's always some guy who saw his computer report 38 for 5 seconds and then tells everyone that's what he gets on the highway...
First of all, I don’t calculate off the computer. I drive ~60-70k a year. I keep a close eye on things.

Second, the “spirited” driving in talking about is akin to track driving. Not putting around across the countryside.

My commute is 90mi each way with cruise set at 80. Hardly ideal either.

So maybe relax a little bit.
I think most people know how to drive to maximize MPG. I do that in my 4Runner, where I've many times beaten the EPA number on trips of hundreds of miles. It's not something I'm interested in doing in this car. If I'm averaging high 20s / low 30s then I'm not using the car for what I got it for. It would have much less reason to be in my garage.

I haven't been complaining about the MPG I'm getting. The issue I have is people throwing shade at those who are getting 20 MPG, as if that's hard to even conceive. Please. There's a reason the EPA number is 20 in the city and 22 combined. And the EPA test is not based on regularly winding the car out to redline.

People peacocking about what great gas mileage they get in a sports car? Weird.
I drive it like a sports car when there’s opportunity, so you must live in a magical place with no traffic, cops, kids, dense housing, cyclists, pedestrians, or animals except for unicorns, I’m sure, but they stay off the roads, so you can drift from turn to turn and launch off every light. You apparently DON’T know how to drive efficiently if you had to ask or you’re just super cool that you choose to waste more fuel than necessary when your speed is still regulated by outside forces, because there’s nothing more manly than wasting shit.
First of all, I don’t calculate off the computer. I drive ~60-70k a year. I keep a close eye on things.

Second, the “spirited” driving in talking about is akin to track driving. Not putting around across the countryside.

My commute is 90mi each way with cruise set at 80. Hardly ideal either.

So maybe relax a little bit.
If I relaxed I'd be getting 30 mpg! :LOL:

I'm reacting to the posts expressing disbelief that anyone else could get poor MPG, like the other guy doesn't know how to drive. They've become a cliche on forums like this. They're obnoxious. They're childish boasting. And sometimes they're based on cherry-picked data (not saying you, who apparently knows what he's doing).

They're also idiotic. You don't have to be a genius to understand that every car will get above the EPA under certain conditions, and below the EPA under certain conditions. So why anyone is surprised when another driver is averaging below the EPA? It's just plain stupid.

As I mentioned above, I haven't kept a strict accounting. But my measurements at the pump and the computer indicate I've averaged roughly around 20. That's hardly surprising when the EPA Combined number is 22 and I spend way more time in city conditions than highway, and tend to drive it hard on every trip. In fact I'd say my average is a bit better than one might expect given the EPA City number is also 20.

PS And yes, winding out on country roads is not gonna kill MPG the way city driving does, with lots of starts and stops. So I really don't get the point. People who get high MPG are driving in conditions and with behaviors that cause high MPG. People who get low MPG are driving in conditions and with behaviors that cause low MPG. Why this is shocking to people is a mystery. Or it would be, except that what we know is really going on here is people looking for an excuse to brag and cast shade on others. That's the problem with this whole topic.
See less See more
  • Like
Reactions: 1
If I relaxed I'd be getting 30 mpg! :LOL:

I'm reacting to the posts expressing disbelief that anyone else could get poor MPG, like the other guy doesn't know how to drive. They've become a cliche on forums like this. They're obnoxious. They're childish boasting. And sometimes they're based on cherry-picked data (not saying you, who apparently knows what he's doing).

They're also idiotic. You don't have to be a genius to understand that every car will get above the EPA under certain conditions, and below the EPA under certain conditions. So why anyone is surprised when another driver is averaging below the EPA? It's just plain stupid.

As I mentioned above, I haven't kept a strict accounting. But my measurements at the pump and the computer indicate I've averaged roughly around 20. That's hardly surprising when the EPA Combined number is 22 and I spend way more time in city conditions than highway, and tend to drive it hard on every trip. In fact I'd say my average is a bit better than one might expect given the EPA City number is also 20.

PS And yes, winding out on country roads is not gonna kill MPG the way city driving does, with lots of starts and stops. So I really don't get the point. People who get high MPG are driving in conditions and with behaviors that cause high MPG. People who get low MPG are driving in conditions and with behaviors that cause low MPG. Why this is shocking to people is a mystery. Or it would be, except that what we know is really going on here is people looking for an excuse to brag and cast shade on others. That's the problem with this whole topic.
So, if I got this right, you’re telling me track type driving is better for fuel economy than city driving?

Gonna be a hard no on that one, and anyone that’s ever taken a car to the track knows that.

It’s just weird to me that people can manage so low on the street. Like I said, it’s either 24/7 flogging, possibly fuel quality, extended idle time, or there are some large differences between cars. Be it maintenance, break-in, I don’t know. But if I skip the “spirited” driving and just commute like a normal human being, I’m in the mid 30s. The highway driving actually brings it down the most.

Maybe I and a few others got unicorns. Or maybe not. Who knows. 🤷‍♀️
So, if I got this right, you’re telling me track type driving is better for fuel economy than city driving?

Gonna be a hard no on that one, and anyone that’s ever taken a car to the track knows that.

It’s just weird to me that people can manage so low on the street. Like I said, it’s either 24/7 flogging, possibly fuel quality, extended idle time, or there are some large differences between cars. Be it maintenance, break-in, I don’t know. But if I skip the “spirited” driving and just commute like a normal human being, I’m in the mid 30s. The highway driving actually brings it down the most.

Maybe I and a few others got unicorns. Or maybe not. Who knows. 🤷‍♀️
Careful with your description of your track type driving on country roads, Duchess may accuse you of being reckless. :LOL:

We should all probably just let this go, I respect you all and value your posts. I'm just mystified when people don't seem to get what "average" or "estimate" means when it comes to EPA numbers. It's math. Some drivers will do better than the EPA numbers and some will do worse, and this depends primarily on driving conditions. The people who are honest-to-goodness doing better are simply driving under conditions that create that result. And visa versa. So no one should be surprised that people doing primarily City driving are getting around the City EPA number.

The EPA test doesn't bake in "reckless" or "jackassery" driving. It's based on typical city driving conditions. It's unfortunate for me that far too many of my miles are either commuting (and in an actual big city) or in dense suburbs with lots of intersections and lights. And typically for only several miles between restarts. I have to drive 20 minutes to get to country roads, where my spirited driving seems to produce in the high 20s and where normal driving will get a reported 30ish.

All of it makes sense. No one should be assuming that's something's amiss.
See less See more
I get right what it says on the sticker - 20 city, 27-28 freeway on 91 in Los Angeles, sometimes 18 or 19 city. I prefer shifting at the lowest around 3000-3500. Surprisingly I tend to get 22/24 when hitting the canyons with lots of sustained higher rmp.
  • Like
Reactions: 1
61 - 80 of 83 Posts
Top