I have both, my driveway is down hill. sometimes it's nice to have, when we get a big snow. but I never use mine to tow my boat. the cumberland ramps are as steep as any around, and my two wheel gmc never has any trouble. it's a 5.3 vortech auto with towing package. it gets 17mpg without my boat behind it. and 13 mpg pulling my boat. my friend has a 2007 gmc 4x4 with same engine and trans. and he gets 8 mpg on I-75



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