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Since I'm driving a 16 year car, my basic rule is that every mod I do to my car has to pay for itself in fuel savings within 2 years. So far I have spent $400 in aero mods and have raised my mileage from the mid 40's to the high 60's. Since I drive about 35,000 miles a year, my mods have paid for themselves many times over. The above rule is why I don't have a lean burn VX engine in my car yet. But when my current engine wears out and needs rebuilding or replacing, then I will consider putting a VX engine in my car.
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