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Go to the "65 efficiency mods" link in the top of the page. There are many things there that are already proven to increase 1-3mpg or far more. Take any of those mods and make a product out of it. Well even help you improve that product! And if it's well made at a good price that justifies the return investment in less fuel costs, some of us here would even be happy to buy it.
A lot of people here don't have the skills or resources to make something like a kammback with the fit or finish that would pass the "wife approval test." Some people want more mpg, but care to much about what other people think about them to tape cardboard and coroplast to their cars. If you made a molded plastic kammback for example that looked oem enough, then you have a market to sell it.
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I try to be helpful. I'm not an expert.
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