Does anyone have any before and after mileage results? I like the idea of aftermarket upgrades but if they result in the same fuel performance then what's the point?

-Troy

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- - - '77 federal 280e - 222k miles
- - - '85 380se - 129k miles
- - - '07 Chevy truck
- - - '79 Datsun 280zx with '82 turbo motor
- - - Currently looking for a clean 190e with less than 160k miles.