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Your best bet for improved gas mileage is more air pressure in the tires, but not above the max rating. Also larger tires well help some, but driving technic, in other words, driving with a light foot on the throttle would be your best bet.
There are a few products that will give token improvements in gas mileage, but only that.
I have found one item that mosy likely would give you the best mileage with the least amount or no gas...it's call a SKATE BOARD.
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