Ever since I received mine, '05 GT, I have gotten between 21 and 23 MPG. I currently only use premium fuel and get my fuel at quality gas stations. I only also have 1300 miles on my car. I use Mobil 1 synthetic oil whether that helps or not.
To add also, this is driving the vehicle 50/50. 50% screwing around with no regard to milage savings (this car is just to dang fun), launching at stoplights, passing etc and 50% driving at normal speeds, normal starts and stops etc. My highest fuel milage once was 24.8 MPG, worst was 19.2 MPG.
I live at an altitude of 7000' in the Rocky Mountains too.
To add also, this is driving the vehicle 50/50. 50% screwing around with no regard to milage savings (this car is just to dang fun), launching at stoplights, passing etc and 50% driving at normal speeds, normal starts and stops etc. My highest fuel milage once was 24.8 MPG, worst was 19.2 MPG.
I live at an altitude of 7000' in the Rocky Mountains too.