natorade

How on earth did you get 17.6 mpg towing anywhere, let alone through mountains?

I pull a 4000# boat with no passengers or gear and get 12.5 - 13.5 in Michigan.

frieed

I just towed a TT up to the Uintas this past weekend
I'd guess 8500# trailer and gear.
Up and over Bald Mt. pass @ 10759'. The approach to that pass is about 7% grade.
The truck held 55 mph (the posted speed) easily in 3rd gear @ 3000 rpm.
Round trip from Draper Utah yielded 8.7 mpg.

2013 XLT 4x4 EcoBoost w/3.55 e-locker.

Akray

Honestly I am not sure. I did not hand calculate when i next filled up which i should have. but thats what my lieometer said haha. im not to sure how accurate it is but thats what it said. i filled up before the trip and reset everything. the mialage wasnt to pretty in the biginning, but after about 50 miles it just slowly started going up and up, must be because of the socal tunes, idk.... when my father in law towed his TT with it he said he got about 18.1..... but it was about 30-40 miles of a VERY VERY slight down hill haha

magblue10

I took the p rated wranglers off and went to a 10 ply E rated tire and the difference is huge. I pull a 28ft TT. The WDH was set up the same way for both sets of tires. With the stock tires I wasn't getting sway just that sidewall flex that I didn't like, it is gone. I will say that when I changed the tires I also went to a new set of Rancho RS9000 which on the softest setting were stiffer than the stock shocks. I have a fx4 cc EB with 3.73 2012. Hope it helps you out

frieed

I think you confirmed what I suspected.
Please confirm that the difference you experienced was over the several to 10's of seconds of tire roll while traversing a corner. If so, shocks are out of the question.

jdog0411

Are you guys using the Tow/Haul mode on the transmission when towing? I know it reduces the amount of shifts and saves wear, but it also seems like it stays out of the power band most of the time. I haven't towed much with my truck so I was wondering what the difference is in real world towing.

magblue10

I'm not totally sure what you mean. The tires make a difference for sure. The shocks stiffened up the rear of the truck but without a 8 or 10 ply tire it wouldn't matter. I have Rocky Mountain ats from tire barn. Tough as nails but heavier than all the others

frieed

Sorry for the confusion

The tire flex I was experiencing was a sustained event that would remain for however long the corner lasted. Shocks dampen sudden bumps and so would have little effect on a sustained sway. That said, I'll not argue that better shocks would handle the bumps dips better.

canadian-nut-fx4

Well I have a 2012 Fx4 w/3.73, I have towed my 7500lbs TT with the stock GY rubber, then my wheels were stolen, this gave me the chance to upgrade my tires, I went with Hankook Dynapro ATM E rated tires, since then I have towed my trailer and a 27ft enclosed car hauler loaded with my house (I was moving), and the 10 ply made a huge difference, the truck feels more stable and more confident, I still only have the factory shocks, and I find them a little soft, but for now they do the job.

frieed

Thanks Magblue and canadian-nut...

I think new tires are in order sooner rather than later..