I drove from florida , TO newfoundland, canada. On the highway we were driving average 100 mph. We got average 400-440 miles per tank. With 20" wheels i am gettin 380- 400 Non highway driving. But Here in Newfoundland there are hills everywhere.

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2006 Liberty CRD
20" Boss Wheels/Yokaham M+S Tires (31")
T & H Grill Guard
3" Suspension Lift
Sticky Chrome Lookin Stuf Everywhere
Renegade Light Bar
Lots Of Lights

Did you just say you were driving 100 miles per hour driving from Florida to Canada?

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2002 Jeep Liberty Renegade
3.7L V6 4x4, 5-speed manual
*Draw-tite class IV hitch
*Mopar rock rails
*Clear turn signals
*Mopar mud flaps
*Husky cargo liner
*'Trial Rated' and 'Renegade' emblems
*Bazooka 200 watt subwoofer

Maybe that is KPH and not MPH?

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks