Gas milage drops for 2007 GT

ddws69

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Sep 10, 2019
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couple years ago I was getting 20.7mpg in the summer and 18+ in the winter. Now I'm getting 19.3mpg in the summer. I have 74000+ miles on the car. Do I need to change the plugs? Never have done on this car. Any other ideas?
 
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Noobz347

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couple years ago I was getting 20.7mpg in the summer and 18+ in the winter. Now I'm getting 19.3mpg in the summer. I have 74000+ miles on the car. Do I need to change the plugs? Never have done on this car. Any other ideas?

It sounds as if you could use a complete tune-up. That's because it sounds like it hasn't ever been done and [not] because you calculated a 1 mpg difference in your fuel mileage after comparing after a couple of years. Hell, just a change in fuel formula over the course of a year is more than enough to drive outside of a 1 mpg tolerance.

Fuel Filter
Air Filter
plugs
wires
cap and rotor where it applies
Swap all the fluids
check seals for leaks, etc...
 

Bullitt95

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There's no cap and rotor on the '05+ GT engines. Agree with the rest though.
Also check the condition of the tires and tire pressures. Underinflated tires have more rolling resistance and can hurt gas mileage.