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The first question should be what MPG are you shooting for while traversing the highways of America.
35 mpg?, 40 mpg?, 50 mpg? 60 mpg? over 60 mpg?
Second how much do you want to spend getting X mileage.
We talking what car will get me what mileage? Or are you planning on building custom / extensive modifying X car?
Bench racing is easy when $ isn't involved.
Aero, weight, low engine rpms are the biggest factors for the best highway mileage. A Cd under .32 is a must, weight under 3,200 lbs, 2,000 rpms or less at 60 mph.
If you spend any real time on the highway two must haves is a very comfortable seat, and a nice stereo.
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