Without reading any of these responses I will say that I tested this out the other day.
I filled up my tank and then reset the onboard computer to check my MPG.
It is only 1/2 a mile from the Shell to my house so while driving home I blipped the throttle when downshifting and braking and I watched as the MPG numbers went WAY down. It was 19.2 and dropped to 15.4 by the time I made my final turn into my garage.
When the RPMs go up the MPG goes down.
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