in my 2005 4.4i I am getting aprox. 19 mpg. This is city and freeway commuting combined. On the freeway I am cruising around 70 mph. I have the staggered 19's with michelin diamaris' set at 38 psi all around. I use Chevron 91 octane fuel. I drive pretty conservatively during the commute but get on just about everyday a little to hear that great engine . And one other thing, the car is always clean so it reduces friction. haha