Rolling coal is the practice of tampering with a vehicle’s emissions control system, causing it to spew black clouds of sooty exhaust.

  • ditty
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    1 year ago

    Those types of tuners also exist, and depending on the tune they can actually in some cases slightly improve fuel economy (depending on driving style). I tuned my Audi A3 to “Stage 1+” and actually have seen slightly better fuel economy doing highway driving to which I attribute the new ECU/TCU tunes allowing me to stay in gear longer during acceleration I guess?