I just recently bought a 2000 Pontiac Grand Prix GTP. For some reason I have been getting 12.6 mpg average in town, and 19-22 highway. I assumed the car would be getting between 16-24 in town. I have been putting premium 91 octane gas in it so far. I live in Minnesota so the weather now is below freezing from time to time so I let my car warm up for an average of 3 minutes in the morning before I leave. There is a check engine light on and a ABS light on also. I checked the codes and only one came up for the engine and there is a bad ground wire. What potentially could be wrong with my car? I don't believe that the weather could cause such bad gas mileage, but I really don't know too much about cars and mileage. Any input is greatly appreciated, thank you.
Why is my 2000 Pontiac Grand Prix GTP getting such bad gas mileage?
- Thread starter Colin
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