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There are other hidden economics beyond the obvious. For example if you modify a vehicle to get better MPG by reducing the load on the engine due to aerodynamic drag, correspondingly you should also expect a bit longer life out of that engine (unless you did something bad like over blocked the engine cooling). Once you start making major modifications where you appreciably increase the range of the vehicle, you can then fill up the vehicle less often which saves you a bit of time at the pump. Especially with pickup trucks, many spend thousands of dollars on aftermarket replacement fuel tanks to increase the range of the vehicle, typically by around 50% or so. Making a vehicle burn 33% less fuel would provide the same range benefit as a 50% larger tank. Depending on your perspective, this convenience factor may be worth something to you.
I think for many though (like me) it is more of a hobby, and there aren’t many hobbies that have any positive ROI at all, most have highly negative ROI.
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