CLASS RACER FORUM - View Single Post - Duramax vs. Cummins- Need some feedback

Jim Wahl · 12-22-2008, 02:02 PM

I have an '05 Dodge 2500 Quad Cab Heavy Duty with the 11" rear and a 3.73 gear. I get 15+ mpg towing a 24' Featherlite enclosed trailer. The same towing my 30' 5th wheel RV trailer. I get 17-20 mpg around town and 22.5 on the road not towing. I have the Edge programmer and a Volant air intake. I only have 26,000 on it now and the milage gets better as it breaks in. I ran 14.98 at the track spinning badly, as it is a 2WD truck. The trick with mileage on the Cummings engines is to keep your RPM's under 2,000. Anything more greatly reduces fuel mileage.Jim

12-22-2008, 02:02 PM	#4
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,845 Likes: 672 Liked 683 Times in 129 Posts	Re: Duramax vs. Cummins- Need some feedback I have an '05 Dodge 2500 Quad Cab Heavy Duty with the 11" rear and a 3.73 gear. I get 15+ mpg towing a 24' Featherlite enclosed trailer. The same towing my 30' 5th wheel RV trailer. I get 17-20 mpg around town and 22.5 on the road not towing. I have the Edge programmer and a Volant air intake. I only have 26,000 on it now and the milage gets better as it breaks in. I ran 14.98 at the track spinning badly, as it is a 2WD truck. The trick with mileage on the Cummings engines is to keep your RPM's under 2,000. Anything more greatly reduces fuel mileage.Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 NHRA D2 National Open Stock Champion 1982 NHRA D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. Last edited by Jim Wahl; 12-22-2008 at 02:04 PM.