Hi folks, i just bought a 2001 Ford Mustang bas model, the previous owner put on the V8 dual exaust and it sounds pretty good. Anyhow msn autos says i should be getting 20city and 29mpg freeway. I expected to get around 24-25 since i commute to work, but i am actually getting about 17-18!!! Anyone have any input on this issue? Do you think the exaust might cause this? I am driving it pretty nice and try to keep the rpm's around 1500-2500 under normal driving conditions.. the car only has 24,000 miles on it so i would think it shouldnt need a tune up. anyhow any ideas or comments would be helpful. Thanks