I think the problem lies in the t-top and what else stick up and around the jeep. It causes a bit of drag when pulling it down the highway. I borrowed a co workers 2500 Ram truck to bring it up here last summer. The MPG down w/o a load was around 22mpg. On the way back up it was running around 18mpg.
I have no idea what the weight is. I know its less than 3000lbs or so.
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