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One of my cars is 2000 Mustang V6 5-speed manual with 31,000 miles. My problem is that I am only able to get about 10 mpg in the city. Highway mileage is OK, even higher than its supposed to be. I'm hardly ever driving hard, I'm usually shifting gears at or around 2,000 RPM. My second problem is that I don't feel like it have 190 hp. It used to be much faster and it used to speed up much faster in the past (when city gas mileage was still pretty good). I have feeling that my F-150 4.6L could speed up faster than Mustang.
You really need to get the codes read, either from a dealer or your local parts store. Once you have the codes you can begin troubleshooting. Otherwise, you could be chasing your tail for a long and expensive time. Once you have the codes, you can begin narrowing down the problem.
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