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Discussion Starter · #1 ·
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.
 

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I wouldn’t read too much into one bar on the gauge, especially from a full tank where gas in the filler neck might cause some variation from one fill-up to the next. I think that’s too small a sample size and too coarse a measurement.

It should be more accurate to compute this over tankfuls. Note the miles between fill-ups and the amount of fuel it takes to fill the tank to compute mileage. Or let the car do it for you.

But to answer your initial question, I haven’t observed a notable variation in fuel mileage, even in cold weather.
 

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2022 GR86 MT Base - Trueno Blue
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Personally, 1 bar lasts anywhere between 25 miles to 50. Not exactly sure how it really works. It does adjust your bars according to mpgs so could be that. Hard to say
Check fluids and filters lol
 

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Discussion Starter · #6 ·
Thanks for the replies!

I have had the car for a little over 5 months now. This is the first time I have seen it drop quite a bit.

I did the same drive last week and I beat on the car on the way to work and I got better gas mileage that day for some reason. Just found it odd.

Thanks again!
 

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Thanks for the replies!

I have had the car for a little over 5 months now. This is the first time I have seen it drop quite a bit.

I did the same drive last week and I beat on the car on the way to work and I got better gas mileage that day for some reason. Just found it odd.

Thanks again!
I've had mine since may, roughly 9k miles. Seemingly, there isn't a rhyme or reason to the gas mileage after a while. At least you don't have to deal with the below freezing days!
 

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I'm getting 26.4 on average with 3lbs higher pressure at 45°, 215 all season tires. I notice that warmer drier weather the milage goes down quite a bit.
Give gotten 37 highway and 21 at worst ratting around off highway.
I find that no ethanol premium is best and yields higher mileage.
Funny thing is that there is a lit of variety in mileages reported, and some get terrible milage who knows why.
I think its the gas quality myself, in Montana dry summer highway on no ethanol premium I got a hard to believe 42 mpg. Magic gas or something but there I was 40-42 psi.
Cheer!
 

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2023 GR86 Premium MT, Halo
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Note that the car’s computer is a liar. I’ve done a half dozen fillups and each time the actual MPG (miles driven divided by gallons to fill up) is about 1.25 to 1.5 MPG less than the computer reports.

I’ve had many new cars of various brands and most of them also lie. The only recent vehicle I've had that tells the truth: my 2020 4Runner. Other 4Runner owners report the same thing. Its computer is typically dead on or within 0.25 MPG of your hand calculated amount at the gas pump.

My recent worst lying car was my 2019 WRX. That computer tended to exaggerate by a good 1.5 MPG or more.
 

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Lower quality fuels tend to foam which can prevent you from fueling up to the top. That would be my guess. From my experience it can make a huge difference, at least here in the EU where petrol quality varies a lot and changes its formula seasonly.

Otherwise never really trust the fuel level gauges, it is just a rough indication rather than explicit amount. I always count my consumption manually and never trust the board computer.
 
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What surprised me.. the 2900lb gr86 with 220hp gets worse gas mileage than 650hp 3900lb Camaro!
 

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Note that the car’s computer is a liar. I’ve done a half dozen fillups and each time the actual MPG (miles driven divided by gallons to fill up) is about 1.25 to 1.5 MPG less than the computer reports.
If that's the case, mine's getting (28 mpg reported - 1.5 optimistic factor) = 26.5 mpg actual.
 
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Discussion Starter · #14 ·
I'm getting 26.4 on average with 3lbs higher pressure at 45°, 215 all season tires. I notice that warmer drier weather the milage goes down quite a bit.
Give gotten 37 highway and 21 at worst ratting around off highway.
I find that no ethanol premium is best and yields higher mileage.
Funny thing is that there is a lit of variety in mileages reported, and some get terrible milage who knows why.
I think its the gas quality myself, in Montana dry summer highway on no ethanol premium I got a hard to believe 42 mpg. Magic gas or something but there I was 40-42 psi.
Cheer!
Interesting.

Yeah, I did notice that the for a while I did notice the reduction in range when it was pretty warm out here in AZ. I got the car in mid august and we were hovering around 110 degrees. But I felt it did ok. For some reason, this colder weather, I noticed more crappy mileage. Unfortunately, we dont have anything higher than 91 octane, unless we go with e85.
But I have heard some people mixing a bit of it to help prevent knock during hotter temps.

I guess it is what it s for now.

Thanks!
 

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Discussion Starter · #16 ·
Note that the car’s computer is a liar. I’ve done a half dozen fillups and each time the actual MPG (miles driven divided by gallons to fill up) is about 1.25 to 1.5 MPG less than the computer reports.

I’ve had many new cars of various brands and most of them also lie. The only recent vehicle I've had that tells the truth: my 2020 4Runner. Other 4Runner owners report the same thing. Its computer is typically dead on or within 0.25 MPG of your hand calculated amount at the gas pump.

My recent worst lying car was my 2019 WRX. That computer tended to exaggerate by a good 1.5 MPG or more.
Hmm.. interesting.

So basically, just suck it up and deal with the fuel consumption! lol!
 

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Hmm.. interesting.

So basically, just suck it up and deal with the fuel consumption! lol!
That’s how I feel about it. Didn’t get the car for good mpg. Would be nice to clear 30 on highway trips, which I imagine is realistic if you’re easy on the gas, but I’ll be content to get in the low 20s overall. My last tank was 18ish!
 

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2022 BRZ Limted 6MT White
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Coming up on 5000 miles and fuel mileage has been averaging 25-26 by calculation. The car computer mileage is always 1 to 1.5 mpg higher. My 2016 Subaru Outback 3.6R always shows better on computer than pump calculation. Mix of local and highway driving is typical scenario. I have a 2019 MX-5 and it averages 32-33 mpg. My 2019 Ranger almost does as well as the BRZ.
 

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Discussion Starter · #19 ·
That’s how I feel about it. Didn’t get the car for good mpg. Would be nice to clear 30 on highway trips, which I imagine is realistic if you’re easy on the gas, but I’ll be content to get in the low 20s overall. My last tank was 18ish!
My last two trips I have averaged 32mpg.
But keep in mind, I have a AT.

I will be taking another trip this weekend and I will compare the consumption to the last two trips.
 

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Discussion Starter · #20 ·
That’s how I feel about it. Didn’t get the car for good mpg. Would be nice to clear 30 on highway trips, which I imagine is realistic if you’re easy on the gas, but I’ll be content to get in the low 20s overall. My last tank was 18ish!
Around $18 for a full tank? How much is the fuel where you are at?

I had a 1/4 tank this weekend and topped it off with $13.00
But I guess it depends on the price per gas station.
 
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