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Air the tires to maximum sidewall pressure, typically 44 or 51 psi. That'll help a bit.
To answer your original question, I usually get better mpg in high altitude hilly conditions. I got 59 mpg for 165 miles from Gallup to Tuba City, and 51.5 mpg for 1213 miles from Gallup to the Bay Area. Last Summer I had 3 tanks >50 mpg driving around in SE Utah.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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