I have not adjusted anything, just swapped out on my '06 Tacoma with extended cab. The engine is smoother and more responsive. It has little effect on fuel consumption. I reset Trip 1 every time I refuel. Next time I fill up, I divide those miles by gallons purchased and then reset them; usually got between 23.0 and 23.5 mpg. If it goes below 22.5 Replace engine air filter; it fixed it.
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