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if this isn't sarcastic, you keep the gas pedal floored as you shift (manual cars only) very quickly. I don't really recommend this unless you have a strong clutch and a built trans or you'll blow one or the other up eventually.
powershifting 3rd to4ghwas consistently worth 1mph in my car when it was bolt ons... i had already powershifted to 2nd, and babyshift to 3rd because of tranny issues..