Best Gasser......
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If it's newer go with a GM. The 6.0L and the 8.1L basically get exactly the same fuel mileage but the 8.1 has a ton more power so try and find one if you can. My FIL has a 6.0 and with an empty truck and staying under 70 he gets low 13's on the a highway trip if he's lucky. Most of the customers that came into the dealership were reporting 10.5 to high 12's for highway mileage. Towing drops you down into the 9's or worse. The GM gas LS series are nearly bulletproof and require very little maintenance. I've personally seen them go over 200K when taken care of.
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