Duramax reduced mileage - TDR Roundtable

Duramax reduced mileage

09-14-2009, 11:29 PM

#1 (permalink)

captainmike

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Join Date: Sep 2006 Location: Florida Posts: 50

Duramax reduced mileage

I have the Cummins. My friend has the Duramax, '07 GMC. He was getting about 16 mpg, but recently it has dropped to the 13-14 range. Any ideas?
Any help would be appreciated.
Thanks, Mike

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