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My MPG took a big dip right after I got my HCH back from an alignment; I found out (over halfway through the tank) that the shop had politely set my tire pressure back to the manual's recommendation: 30psi! And one side was actually more like 28.
When I got the car the tires weren't new, and I immediately pumped them up to about 45psi all around. Mileage took a big jump, and I got another 20,000 miles out of them. If higher pressure adversely affects tread life, I haven't seen it yet. Do note, however, that it will affect your tires' grip.
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Lead or follow. Either is fine.
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