Thread: Duramax reduced mileage
View Single Post

Duramax reduced mileage
Old 09-14-2009, 11:29 PM   #1 (permalink)
captainmike
Offline
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
  Reply With Quote