Old Dec 27, 2010 | 06:25 AM
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Just Dave
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The newer GM's with the 6.2 and displacement on demand are supposedly good for about 20mpg.

My friend has a 2008ish F150 crew cab 4x4 on 20's (not lifted), and he gets like 17-18 in combined driving. That's with a 5.4 and auto.
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