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Update: A week with the big mouth and my lifetime mpg has gone up by .4 mpg. Starting to believe some of the claims on here…

Installed mine a few days ago. Had to shave a bit off the top as it was pushing up on the radiator cover and wouldn’t let it sit flush. Interestingly, my lifetime mpg went up by .1 mpg after a few days with it. Was it the big mouth? Who knows, but I’m interested to see if it goes up by more or not.