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dude i was in the same boat! after i got my aluminum pro comp's it was like driving a different truck/car so much nicer! and i have been keeping an eye on my fuel gauge just for shi*s and giggles and it has not moved much compared to the steelies.
yeah john, mine hasn't made an MPG difference but it just drives so much smoother and easier now. You can just feel there is much less strain on the drivetrain and brakes.