I've been keeping a close eye on my mpg lately and I think either there is something wrong with your car or you have a LED foot. I have a JB3 with DCI and AA 3" downpipes, running 93 octane I can average 26mpg with AC on per tank driving like a granny (extremely slow take offs and lots of coasting.) When I drive without mpg in mind, which is a mix of full throttle runs and regular take offs, I average 20mpg.
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