Chevy and GMC Duramax Diesel Forum banner
  • Hey Everyone! Enter your ride HERE to be a part of this months Ride of the Month Challenge!
1 - 6 of 6 Posts

·
Registered
Joined
·
87 Posts
Discussion Starter · #1 ·
Just got back from 4 weeks on the road towing the 4500lb 5th wheel trailer (BW turnover ball/Andersen hitch). 5168 miles traveled and averaged 19.2 mpg. Trip went from central TX to NM, CO, UT, ID, MT, WY, NE and back thru OK. More than few switchback mountain roads. Parked and unhooked the trailer and drove the truck by itself which drove up the mileage, but several “all towing” tanks produced a high of 19 and a low of 17 mpg, albeit not driving over 70 mph while towing. One small glitch, while driving UP Monarch pass on Hwy 50, the “DEF warning, 500 miles to 65 mph“ warning came up on the speedo screen and couldn’t be dismissed with the steering wheel button. I knew there was plenty of DEF and after the climbing and on the downhill portion the warning went away and didn’t appear again. DEF usage was 7.5 gallons. Used tow haul some to help with downshifting on some of the more serious downhill portions, but not a big fan of the tranny screaming at 3500 rpm to slow the truck. All in all a great towing experience and the truck performed well!
 

·
Registered
Joined
·
42 Posts
Nice numbers! I haven’t been able to get my truck to downshift and actually use the trans to help slow it down. Granted my load is probably 1k less than yours and it’s flat around here but I figured it would work like your did in mountains.
 

·
Registered
Joined
·
87 Posts
Discussion Starter · #4 ·
Nice numbers! I haven’t been able to get my truck to downshift and actually use the trans to help slow it down. Granted my load is probably 1k less than yours and it’s flat around here but I figured it would work like your did in mountains.
I think it brake activated while in tow mode, hit the brakes a few times and the tranny says OK I’ll start downshiftin…
 

·
Registered
Joined
·
5 Posts
Just got back from 4 weeks on the road towing the 4500lb 5th wheel trailer (BW turnover ball/Andersen hitch). 5168 miles traveled and averaged 19.2 mpg. Trip went from central TX to NM, CO, UT, ID, MT, WY, NE and back thru OK. More than few switchback mountain roads. Parked and unhooked the trailer and drove the truck by itself which drove up the mileage, but several “all towing” tanks produced a high of 19 and a low of 17 mpg, albeit not driving over 70 mph while towing. One small glitch, while driving UP Monarch pass on Hwy 50, the “DEF warning, 500 miles to 65 mph“ warning came up on the speedo screen and couldn’t be dismissed with the steering wheel button. I knew there was plenty of DEF and after the climbing and on the downhill portion the warning went away and didn’t appear again. DEF usage was 7.5 gallons. Used tow haul some to help with downshifting on some of the more serious downhill portions, but not a big fan of the tranny screaming at 3500 rpm to slow the truck. All in all a great towing experience and the truck performed well!
Wow 19 and 17 mpg is great. Were you always in the tow mode? I did a 4600 mile trip always in tow mode pulling a bumper pull, 5000 lbs camper and only managed 12 to 13 mpg.
 

·
Registered
Joined
·
87 Posts
Discussion Starter · #6 ·
Wow 19 and 17 mpg is great. Were you always in the tow mode? I did a 4600 mile trip always in tow mode pulling a bumper pull, 5000 lbs camper and only managed 12 to 13 mpg.
No, just a few times in the steep and twisty’s, not all day driving. I DO like shifts better from a standstill with a load in tow mode, they seem a little crisper in the first 2-3 shifts. So if there’s a lot of stop/go getting out of a city or something, I’ll use tow mode there. Its a 2WD truck as well…
 
1 - 6 of 6 Posts
Top