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Originally Posted by kompressor
also one more question for now is there any formula or rule of thumb for overall weight reduction vs gas mileage savings.
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EPA says "up to" 2% for every 100 lbs:
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An extra 100 pounds in your vehicle could reduce your MPG by up to 2%. The reduction is based on the percentage of extra weight relative to the vehicle's weight and affects smaller vehicles more than larger ones.
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http://www.fueleconomy.gov/feg/driveHabits.shtml
Unfortunately, it's not qualified, so not terribly useful.