It also depends on which type of tire you buy. Ill check the next time im out driving. I have 33" mud tires on.

 

With my 5.7 and 33's I am getting a little over 20mpg on the highway. City is less, like 15 or 16 currently. The city number changes more depending on how I drive but the highway number is almost always around 20 or 21.

 

Thanks guys.

My sig isn't a typo, I just bought an 04 5.7L, I haven't added it to my sig yet. I'll take care of that right now.