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Higher tire pressure works to a point. Going to the max inflation of 44 psi on the Avons on my Mazda ate the tires very quickly. Since I like to slide around a little, I pretty regularly get about half the rated tread life of any tire running between 36-38 psi (IIRC, recommended is 32), but I only got about a quarter tread life with 44 with the center very obviously worn most (and that was only going to 44 towards the end and driving slow when gas went to $4/gal.). 44 vs. 38 didn't make any real difference in mileage—I only averaged about 1 mpg better per tank, but I was also driving slower.
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