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Good info there Slowmover, but is there a possibility that a stiff heavy-truck tire's mpg's would be less dependent on tire pressure than a passenger car tire? I agree if it were a significant boost you would think the auto mfr's would jump on it, maybe the harsher ride/susp. issues complicate it for them.
I didn't do an actual test, but when I pumped the 44psi max Civic tires up to 50 my butt-o-meter noticed a harsher ride, and reduced rolling resistance. So much so when the front left tire (which has a very slow leak) gets down to 35psi I can tell I need to put air in it by how poorly the car rolls and the slightly higher vacuum to hold highway speed.
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