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Discussion Starter · #1 ·
I switched from OEM to 18x9 +22 Work VS-XX. I have 215/40/18 on them. I filled them with 32/30 psi as it says on the door. My gas milage has significantly dropped. I use to get 600km to a tank in the winter. Now I'm getting about 480-500km. No AC being used or anything. Most of the time, I don't even have the fan running.

So my question is am I suppose to have 32/30 psi or is it suppose to be more? My friend running stretched tires says he runs 38 all around.
 

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VP of Infinite Infinity
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I believe that pressure is for stock tires, or at least the stock size. If your running lower pro tires you'll need more pressure. I have hankook ventus etc 225/40/18, running 36f/38r.
Just what I read.


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Of course it also depends on Your driving style. If your DD or wanting to track/incr handling.
Short is, higher pressure will give you better mileage. Just don't be excessive. Your tire has a max psi rating. Google the common pressure ppl use for your spec tire
 

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I never follows the manufacturer's recommendation. I only use it as a guideline, even with stock wheels, my tire pressure is about 36/35 psi.

Not sure how much heavier/lighter is the volks wheel compared to stock wheel. But heavier wheel will affect your mpg.
 

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I already posted this in one of your other threads but maybe you didn't see it. When I got my OEM 18" A-Spec wheels, they came with a new sticker for the door jamb saying the new tire pressure should be 38 PSI all around. Lower profile tires definitely need more pressure. Although, if you're stretching tires, I don't know how that plays into the equation. Depending on how long you've driven on your tires with only 32/30, you might've damaged your sidewalls already.
 

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Discussion Starter · #6 ·
I already posted this in one of your other threads but maybe you didn't see it. When I got my OEM 18" A-Spec wheels, they came with a new sticker for the door jamb saying the new tire pressure should be 38 PSI all around. Lower profile tires definitely need more pressure. Although, if you're stretching tires, I don't know how that plays into the equation. Depending on how long you've driven on your tires with only 32/30, you might've damaged your sidewalls already.
I think I remember you saying that actually. I bumped up the psi to 36/38 and hopefully that'll improve my mpg. I've only rode them with that low of a psi for under 1000km.
 
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