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Really testing these supposed improvements is not easy. Given the importance of driving technique, perhaps the most important mod would be adding a MPG meter, to both vehicles. It would give you a chance to evaluate changes within a reasonable time, without burning gas on special runs. Can you remove the back seat and do some wheel pickups with the car? Aero mods get attention - you might add advertising value that way. Maybe you can feature LRR tires, too. An aero trailer could radically improve both mileage and carrying capacity.
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