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I've calculated how much gas money I have saved over the past 100,000 miles since I started aeromodding my car 3 years ago and it comes to $2255, assuming an average gas price of $3/gal and the rise in the average FE from the 45mpg I was getting before I started seriously hypermiling and then aeromodding my car, to the 68mpg I was averaging on the previous engine. That's more money than the Blue book value for my car. I had gotten it up to a 54mpg average just by hypermiling before I started aeromodding, so it comes to $882 savings from hypermiling and $1372 savings from aeromodding. Not a bad return from a $400 investment in aeromods, even ignoring the increased interior space and the improved high speed performance resulting from the mods. In my pre-aeromod days, I was having to keep my speed below 55mph (and preferably in the 45 to 50mph range) to get that 54mph average, whereas now I'm averaging speeds in the 60 to 65mph range.
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