Quote:
Originally Posted by BHarvey
My last two tanks were 32 and 34 respectively. This is combined mpg for town/hwy in Atlanta. My 34 was with 44psi and the 32 was with 38psi. The temp had dropped 20+ degrees and tire pressure dropped with it to the tune of 4 psi. So this brings me to a question about tire pressures.
When you adjust pressures to lets say 44psi on a 35F morning and later it heats up to 70F, but without having driven the car, will the pressures now be well over max?
I am aware that a higher inflation pressure reduces the amount of heat the tire generates, and this in turn makes the pressure rise less from 'undriven pressure' to 'driven pressure'.
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Yes, the pressure will go up when the ambient air temp increases to 70F. Its basic universal gas law PV = nRT. Or P=nRT/V. If the temp goes up, your pressure will go up.