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I'm 100% onboard with quantifying returns on investment, and I too keep spreadsheets. Now that you mention it, I will try to be more rigorous with my next vehicle in documenting costs and ROI.
That said, I don't really Ecomod to save money, at least not anymore. I mod to reduce fuel consumption, and to personalize my car. I buy a car I know I can love, and one that's frugal, and my tinkering actively displaces more expensive hobbies.
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