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Just running your a/c is the least expensive solution by a factor of 100 I bet. What exactly do you mean kills your MPG? Going from say 40 to 35 isn't that big of a deal. Maybe $100-$200 a year. However you charge the battery will take some energy too. If you really want to get 40+ and run your A/C just buy a used Prius for probably less than any wierd conversion would cost. Plus I bet adding 300 pounds of battery might also hurt your MPG similar to running the A/C on the belt.
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