How well do you fit with a helmet on?

I'm about 5'10. I was sitting in my car with a helmet on and I felt like I didn't have much head room at all even with the seat adjustment all the way down. I fit better if I push my seat back a little further but it's not great. I prefer a closer to the wheel position. I couldn't imagine if I was 6 foot plus how I would be able to fit in the car with a helmet.

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