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If you really want to break down the economics of hypermiling, you need to do a full NPV calculation on your savings. If I spend $100 on mods this month and save 10$ per month on fuel as long as I own the vehicle, then in 10 months I've paid myself back in a static analysis. But I have to consider how much I'd have if I just put the $100 in a cd or something. So I'd suggest running an NPV calculation using the interest rate on whatever you're using a savings vehicle as a discount rate.
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