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I get 23-25 mpg on the highway if going 55-60. As soon as I get up to 75 to 85 on I-95 though, it drops to 20 mpg. A 5 mpg difference due to the added drag between 60 and 80 makes me think that the added drag from towing (not to mention the added load) will make your goal pretty unachievable. Good luck though. I'm a v6 5speed with 4.10s by the way.
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