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I use fuelly.com to track my mileage. The mobile website lets me punch in the data while I'm waiting for the tank to fill. In theory, you're right - denser air/more fuel should give you more power, allowing for lighter throttle, but in my civic, it's not noticeable. When I accelerate, my foot goes to a certain position, and if I wind up getting there .01s faster, I don't notice it. I admittedly don't check my tire pressure as often as I should. By the time it's cold enough to drop the pressure significantly, the last thing I'm thinking about when i get out of my car is checking pressures. That being said, I'll usually add 1-2 psi once or twice over the winter, and it's never made a measurable difference afterwards. If you look at my chart and smooth out the ripples, it's almost a perfect sine wave, with mpg bottoming out in January. If tire pressure was the only factor, you'd see the mpg jump back up to the high 30's when I top them off. With my 100hp, 210k mile motor, I'm sure the increased oil/trans fluid viscosity plays a role in mpg reduction, in addition to the denser air.
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