Have you towed with the smaller tires before you stepped up? I tow almost the same weight and tires getting 10-10.5. At very reasonable speeds. I truely think that the tires suck for towing. It changes the whole dynamics of the vehicle as to rpm's and leverage to the ground from the tires. I am going back to factory sizes.

I also think that the TC was not locked and you pushed it unlocked.

 

No I havent.

 

FYI, in 2.5 years I have seen some of the worst mileage ever this winter. Down as far as 9 mpg in heavy weather with less weight than you. No other problems like trans temp or power loss but the mileage has been horrible at times.

I am starting to suspect the ULSD fuel has a lot more to do with it than anything. That and some of the worst traveling weather I have see so far. I dunno, but I was ready to pull injectors and drop $2k to have them rebuilt even though I have no other symptoms.

 

I get way better than that (11-12 mpg) pulling nearly twice the weight, in the mountains no less with a little-bitty S.O. engine. Sumthin's definitely wrong. Maybe you should sell the ford, bad karma.

Also check your tire pressures on truck and trailer, I run mine at max all summer.

 

Well I am going to have someone take a look at the trans for me and start there I suppose. Tire pressure is max for cold pressure both truck and RV.

Oh and I would sell the Ford but if someone came to take a look at it to buy it I am sure they would want me to pay them to take it!

J/K its not that bad but it is old, crusty, and has a hair problem The dogs sure do love it though!

 

The mountains in Iowa? or the mountains of the rockies or west coast? big difference.

 

Only one of those are really mountains

 

They have mountains in Iowa ??

(I meant the MOUNTAINS of Wyoming, Idaho, Utah, Nevada and other surrounding states)