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Keep reading and do some math. Most mods can be done cheap or free if you know where to look for materials. It also depends on how much gas you burn.
In the garage there is a line that calculates $saved. I'm at $1100 over three years but I don't drive much. I have not spent anywhere near that much on mods. Someone who drives far every day can save quite a bit.
I, personally don't worry too much about the accounting because to me it's an interesting challenge to be the most efficient I can.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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