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Old 01-28-2013, 01:41 PM
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68NovaSS 68NovaSS is offline
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I have an '09 6.6 Duramax with the Allison 6-speed automatic. Empty I get 18-20, but pulling my 15,000 pound 5th wheel, up and down hills, or flat and level it's a pulling machine, but....8 - 10 mpg overall.
You can never have too much power, just not enough traction...

Semper Fi

Midnight Sun Street Rod Association
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