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Testing out the Chevron again sounds like a good idea. I'm curious to see if the additives in the Chevron really give you a bit better MPG (4%), though I'm guessing most of it is due to the 10 degree drop in weather. But you can never be too sure without testing data.
Either way, the best way to find out what is causing the change in FE is to try to single out the variables. This is not always feasible or easy to recreate, especially since some things are out of our control. But good luck either way.
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