all depends on what year and engine i got a 04 4.7 v8 and i love it today i filled up for 37.00 and i was almost empty gas was 2.29. i can get about 14-16mpg city and my i can get 20mpg highway @ 70mph. my dad also has a 04 same engine and everything and thats his mpg. my mom has a 6cylinder and she can get about 14-17mpg city and around 24mpg highway. they drive great and look great too. my v8 packs a punch. test drive a 6 and a 8 and you will like the 8 so much better allthough the 4.0 6 cylinder is famous for lasting 150-300,000miles our 95 GC had the 4.0 and we sold it with 190,000miles no major problems. we had a 01 GC and we sold it at 130,000miles no major problems no matter what you get you will be happy. i trust the 04 and older ones more than the 05 and newer ones but thats just me