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Check the basics first. Tune up your car.
My favourite mod was removing my alternator and running on one or two deep cycle batteries depending on the distance/load. went from 20 to 26mpg.
Second best was a mod group: grille block / deflector / 2 inch airdam. went from 29 - 38 mpg
Third Tire pressure.
Timing if retarded can cost mpg. You can usually advance past stock 5 degrees especially if you don't pull trailers or have lead loafers. If your engine is knocking retard a couple degrees at a a time till it stops.
If your car has high mileage check your oxygen sensor. Mine was toast and was actually working in reverse causing both an over high and low fuel mix.
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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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