Hitting 18 on the interstate is fairly easy, so long as the wind is in your favour. I've only hit 20mpg once, that was from puttering around Yellowstone at 45 mph for several days. The aerodynamics at high speed is a wall that you won't overcome in stock form.
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If you're in Nebraska and the wind stops or you see a tree, pull over immediately and take a nap. You're having road hallucinations.
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