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Its actually kinda hard to get fuel economy out of the 6.2. My friend has a c20 long bed that got pretty much the same mpg from the 305 to the 6.2 it could just pull more. Eventually it ended up with a 6 speed and a 4.3 vortec and i think he's hitting 23 avg with it. 17 best with the 305 and the diesel.
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