I have a 2003 mustang
v6 and the gas mileage is terrible in it! It was at 12 MPG then I changed the air filter, fuel filter, plugs, wires, and oil change and that brought me to around 15 MPG. I then replaced the EGR valve and I am between 16 and 17 MPG now.
I drive mostly highway and do not drive that hard. Also there are not any vacuum leaks that I see and no check engine
Any ideas on what I can do to find out the issue or what to change next?
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