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I have to be careful using this method, so that I don't inadvertently force my engine computer to go into open loop. My wideband O2 meter gives me an indication of this when it goes down from 14:1 or so, down to 12:1 or even 11.5:1 (ugh).
That aside, properly executing "punching it" will cause the engine to work more efficiently to accelerate your car to cruising speed.
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