Is 9mpg when towing a rv with 8000lbs normal?

[Kevinstrek]

I got a new 2011 6.7 diesel 4x4 sc 4 door.

I town a toy hauler with a distribution hitch and airbags in the bed to level the load. Still I seem to get 22 when empty and 9 when towing no engin issues as far as I know? I just was shocked the drop is that high. It's a bumper pull. Double axle trailer. 22 feet long. And higher than a camper cause it's a toy hauler for my rzr Sxs. Is this kind of drop normal. I towed the same trailer with the new 5.0 V8 and the same mileage so diesels are no better then?

Thanks for your help.

Kevin

[JeffG5]

I've got a new 2012 F-350 6.7L towing a 14,000# fifth wheel trailer and have gotten 11-12 mpg in northern Illinois (i.e. flat) in 400-500 miles of towing. But in daily non-towing driving I'm only getting 16.5 mpg. Total miles 2250.

[Kevinstrek]

That was just what I wanted to know. Thanks. It's normal then. I pull my toy hauler up some massive hills here. So it's just normal. But I think a bigger tank is in order. It's just too small for me. I go through it so fast.

[JeffG5]

Glad to help. Just remember if you add a bigger tank you're adding weight in both the tank and extra fuel. Don't know where you are on weight limits.

[Kevinstrek]

True. But the extra fuel unless massive amounts can't be a major factor in making the difference. I have the 6.7 ft box not the 8 that I now think I should of got. That makes the tank small and I find my fuel stops very frequent when towing.

[sidekick9409]

I only get 16.5 empty and 10.5 pulling my fifth wheel, But I have a lead foot and I drive on the average about 80 mph.

[countrylife]

I've got a 9500# travel trailer I towed to Maryland from Texas. Got better mileage going than coming. About 12 headed to Maryland and only 10 coming back. So 9 mpg isn't to far off. Probably wind & weather conditions contribute to the drop, it's got a large cross section. I've got a 2012 4x4 sbcc. It still is about 50% better mileage than on my 8.1 GMC. I've just added another fuel tank.

[gene c]

i just got back from a 6k mile trip from So Cal to Fla up the 95 back across on the 40 pulling my fifth wheel the total average was 12 mpg........ what a great truck love it mor than my 96 7.3............

[roadkingfl]

I have a 36' TT (11k approx. empty 9.3K)...2011 F350, 4x4, 67gal, fuel tank, LB, 18" wheels 35" tires...17 empty and 9 towing.

[djc1208]

Originally Posted by Kevinstrek

I got a new 2011 6.7 diesel 4x4 sc 4 door.

I town a toy hauler with a distribution hitch and airbags in the bed to level the load. Still I seem to get 22 when empty and 9 when towing no engin issues as far as I know? I just was shocked the drop is that high. It's a bumper pull. Double axle trailer. 22 feet long. And higher than a camper cause it's a toy hauler for my rzr Sxs. Is this kind of drop normal. I towed the same trailer with the new 5.0 V8 and the same mileage so diesels are no better then?

Thanks for your help.

Kevin

======================================

What rear-end do you have Kevin? I have a 2011 6.7 with 22,000 miles now and tow a 8000# Toy Hauler on my under bumper hitch. Here in Texas.... I have the 3:31 rear end and have gotten as much as 17 MPG with no hills or wind.. Other times 13 to 15 MPG....

Check out Titian Fuel Tanks, they are factory replacements. Hold 50 gallons cost around $800-900 plus installing Fee $250.00 to $500.00 or do it your self, they say its is pretty easy just swap out pump and fuel gauge stuff, takes about 2.5 hours.. Dealer can adjust Truck computer to handle new tank size for $95.00 I hear.. Check with Dealer, I hear the 2012 trucks no longer come with the smaller tank 26 Gal.. Might be able to use new tank in your truck...
Good Luck
DJC