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Look on an enthusiast site and you'll quickly find what you seek. The first step is to learn more about your car, so you know what mods are compatible. Incidentally, more HP < mpg, is misleading. It's actually HP being used, not max. power possible. My car might make over 50% HP than stock, but my mpg's have actually increased. Lower rpm's are possible with greater torque, boosting economy, unless you use the extra power.
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