Performance and Fuel Efficiency aren't usually in the same sentence. Unless that is to say, they don't go together.
Tuned up, regular Oil changes, and good tires at the proper pressure are the best things you can do.
There is little to nothing you can do to improve gas mileage. Certainly don't believe that hype about a little chip that will give you 10+ better MPG, or any chemical you can put in.
It doesn't work. Otherwise the OEM's would put in that little $25 chip in themselves.
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