# 04 Jeep Grand Cherokee poor mpg than EPA rating **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cherokee, sensors, fuel-economy, jeep, filters\ **Created:** [April 26, 2011, 6:17am UTC](https://community.cartalk.com/t/04-jeep-grand-cherokee-poor-mpg-than-epa-rating/64087 "2011-04-26T06:17:03Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![luckyu2c](https://avatars.discourse-cdn.com/v4/letter/l/f07891/32.png) [@luckyu2c](https://community.cartalk.com/u/luckyu2c)\ **Post date:** [April 26, 2011, 6:17am UTC](https://community.cartalk.com/t/04-jeep-grand-cherokee-poor-mpg-than-epa-rating/64087/1 "2011-04-26T06:17:03Z")
I have a 2004 Jeep Grand Cherokee I6 4x4 that I just got. It has 128,000 miles on it and I always drive it in 2WD. I got the Jeep with a bad tranny, so I had new rebuild tranny. Ever since I got it, I been getting 12mpg no matter how I drive, and I am a very light foot person. Some people on other forum have suggested that it could be a oxygen sensor or try replacing the air filter. What should I do? FYI- I know Jeep GC don’t get great MPG, but I was expecting EPA rating of 14-19mpg city/highway. ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [April 26, 2011, 3:51pm UTC](https://community.cartalk.com/t/04-jeep-grand-cherokee-poor-mpg-than-epa-rating/64087/2 "2011-04-26T15:51:24Z")
Try changing the thermostat. I recommend changing every 5 years anyway. Test the temperature sensors. Check for dragging brakes. Check wheel alignment, and of course tire inflation. ---
**Author:** ![chaissos](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/chaissos/32/2347_2.png) [@chaissos](https://community.cartalk.com/u/chaissos)\ **Post date:** [April 26, 2011, 4:04pm UTC](https://community.cartalk.com/t/04-jeep-grand-cherokee-poor-mpg-than-epa-rating/64087/3 "2011-04-26T16:04:42Z")
If the tranny you bought was rebuilt, consider going to a dealer to have the software checked out.