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You're probably right that different pressures are best for different situations/cars. However, I should point out that the difference between 35 PSI and 50 PSI was the world for me. I'd estimate a 5 to 10% increase in FE (1-2MPG) and I refuse to test this because I never want to go back to the lower tire pressure, even just to test. With the old pressure, I would be lucky to get 19 MPG, while with the new MPG I had a tank with maybe 10 hours of almost stopped traffic and I still managed to get 19 MPG.
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