ok, quick question, why am i getting the same highway gas mileage as city gas mileage? It's a stock 2001 Trans Am A4. It seems no matter how i drive i get ~18 mpg. if i romp on it around town, ~18.1. Cruising down the highway @76, ~18.9. Any explaination?

I just realized i posted this in the General repairs section. if this is wrong, please move it. thank you.

 

Do you live in a hilly area? I get similar gas milage in hilly areas.

 

I drive over 400 miles per week, mostly highway at 75-85mph. I generally get 21-22 mpg. Around town less, but not a lot less. Its an M6. Usually 320-360 miles per tank.

 

yeah it's a hilly area. the only thing i can't figure out though, is when i first got the car i was getting about the same mileage as you 2000 taws6, and for some reason it just dropped off and leveled at about 18.

 

Check your O2 sensors, as they go bad, mileage goes with them. They dont throw code until they are REALLY bad as comp tries to compensate for them until it can't.