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It seems to me that the effects of wind drag would be more dramatic on a vehicle trying to go uphill. I know my car (1997 Toyota Corolla 1.6L) can get 40 mpg in 2nd gear (3 speed automatic) but I have to go 25 mph. On a steep incline I would have to go pretty slow and downshift to 2nd just to make it up the hill. I think extremely slow in a lower gear would give the engine a better mechanical advantage, but you would have to go pretty slow.
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