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The 2 things that helped me the most (thus far) have been narrow light weight tires with steel wheels. And having my stock computer programmed with the low altitude factory program.
Most aluminum wheels are actually heavier than stock steel wheels in the same size. And there was a recall on the stock computer for my van. The new program they put in made a giant difference.
My best thus far has been 26mpg highway. With my goal being 30mpg. My next mods will be new tires for summer, domed hub caps, electric fan conversion, and power pulleys. I wanna see where these leave me before messing with any aero mods. But a partial grill block, front and side skirts are in my future.
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