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I have a 2001 GMC 3500 dually crew cab long bed with a 8.1 and allison auto.I tow a 40 foot Fuzion toyhauler with a Harley Ultra Classic in the back, Probably around 16000 pounds. The truck pulls fine but does get bad millage 11 mpg empty 8.3 average pulling at 60 mph. Truck has been paid for a long time and it just wasn't worth $50,00.00 dollars to get 4 more mpg and a little more power. That is just my own opionion I can buy a lot of gas for $50,000.00 dollars. Being retired I'm in no hurry either, Headed for Alaska on Sunday. Good luck with your decesion, I love my truck George
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