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I just put a diy half tonneau on this weekend, and I am driving with a vacuum gauge. Problem is with it being an OBDI I have to wait until I fill up get an accurate mpg. With a wai, am I correct in thinking it would tell the comp that there is less oxygen in the air, so it would lean out the mixture? If so, by driving with the vacuum gauge and feathering the throttle, wouldn't I get better MPG?
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