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Considering aerodynamics, orange4boy, have you noticed if you get better mileage at high altitudes? I took my Previa to the top of Pikes Peak earlier this year, and noticed the whole time I was in Colorado my fuel mileage was much better than in Oklahoma (here in Stillwater we're at about 984 feet). I'll get 18-20mpg in Oklahoma, my best tank in Colorado was about 26mpg. No mods of any kind.
I would guess you're around 10-100 feet above sea level most of the time, but perhaps if you to Mt. Rainier or something once in a while you might see higher fuel economy, although your aero mods may have much less of an effect than they do at sea level (maybe they'll not even 'pay' for their own weight).
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