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Legal issues aside, tire pressure can have significant effect on fuel economy.
If I set my tires to 32-34 psi, I get 20 mpg if I'm lucky.
At 38 psi, I can get about 22mpg.
At 44 I get 24-25 mpg.
These are winter numbers. Summer mpg figures are a bit better, sometimes touching 30 mpg.
This has been the case with every vehicle I have had. Not the exact numbers, but the relation of psi and mpg. Handling and responsiveness also increased with psi.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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