I’m thinking about buying a truck and a 20k 5er, and wanted to get an idea of mpg. If I’m traveling on the highways at 65 mph, do you have an idea on the mpg I might get. I’m hoping others have a similar setup, and might be able to share their experiences. Thanks in advance

10 my guess, have owned 4 diesels

Touching on 12 if soft footed, but agree that you can count on 10 and be in the ballpark. With some mild breathing mod's and tow chip, I get 23 empty, honest and on plus side, again, soft footed. 2008 3500 Dodge dually.

I’m goimg to say less than 10 pullimg a 20k lb 5er. Also if a newer emissions equipped model there seems to be a lot more variation in MPG from truck to truck even of the same brand.

Mine 2007 classic before DEF. 23 empty and 13 with 3k truck camper.

I never get better than 9 towing

GMC Sierra 3500 diesel dually MPG | Good Sam Community

TimnJo
Explorer
Jul 18, 2018
I get between 10 & 11 (22L/100KM)
GVWR on my Cameo is 16K and I'm pretty close to that, put on over 12,000 miles, mostly towing, from January to present.
ksss
Explorer
Jul 16, 2018
With an '18 SRW 3500 pulling 15K of Toy Hauler, I get around 9.
Cummins12V98
Explorer III
Jul 15, 2018
larry barnhart wrote:
Ron that is true. I don't feel our truck would
work with your weight. A good match for us with the alpenlite and chebby

If my wife's surgery recovery keeps going well we will be traveling South in late Oct. One month later than normal.

chevman

I hope everything goes well for her!
larry_barnhart
Explorer
Jul 15, 2018
Ron that is true. I don't feel our truck would
work with your weight. A good match for us with the alpenlite and chebby

If my wife's surgery recovery keeps going well we will be traveling South in late Oct. One month later than normal.

chevman
Cummins12V98
Explorer III
Jul 15, 2018
larry barnhart wrote:
We have traveled enough on our 05 chev dually and 2001 alpenlite to know what is the normal for us. Usually 11 mpg with more at times and less at times. 22920 combined weight. Math but the truck was correct before 2009 when the speedometer had an issue. Now it is close but correct is how I want the answer to be.
I guess 05 is not a modern diesel engine but ok for us.
chevman

You and I travel similar paths towing. You are at 11 and I am at 9 average. Difference is weight I would say as my combined load is 10,000# heavier than yours.
B_O__Plenty
Explorer II
Jul 14, 2018
same as all the other trucks that size..about 10mpg. Doesn't matter what make, not any difference. I've had a couple different ones.

B.O.
LanceRKeys
Explorer
Jul 14, 2018
If your spending that much on a rig, the only reason mpg should matter is to figure out how long you can drive between fuel stops.
HTElectrical
Explorer
Jul 14, 2018
Bionic Man wrote:
With that much weight I would say 8-10. I’d be shocked to see it above 10, and I wouldn’t be surprised if it dips slightly below 8 if you are bucking wind.

X2
Bionic_Man
Explorer
Jul 14, 2018
With that much weight I would say 8-10. I’d be shocked to see it above 10, and I wouldn’t be surprised if it dips slightly below 8 if you are bucking wind.
IdaD
Explorer
Jul 14, 2018
At 65 highway with that size FW I'd bet on 9-10. The new DEF equipped diesels get close to the mileage of the older pre-emission diesels, with a lot more power and in much nicer trucks.