Georgia Terrapin

It's calculated using Fuelly.com

TBondu

Got 9mpg round trip this weekend towing a 20' travel trailer. Mostly highway at 65mph through southern Wyoming. Which means I had 30mph headwinds both ways.

TBondu

Forgot to specify - 2017 3.5EB with max tow (3.55). ~4k lb trailer weight.

Morgan Grant

2018 3.5L 3.31 Rear end. 4WD SCREW. 22 Liters/100 which = a bit better than 10MPG.

450Km rounder. head wind going south, tail wind going back north. Full profile 4000 pound camper trailer. Disappointing, I thought. Was going 100KMs/Hr (62mph) both ways, which is sllowwwww for me. I've got a 3000 km trip out through the mountains of BC this summer. Going 100 as opposed to 110, 115 makes a difference.

I'm sure you people with a similar truck are doing the same, but I found it works much better (yes it can get a lot worse) towing this kind of load in 6th gear. If you leave it in Tow/Haul and let it do it's thing it's always trying to get into 7th or 8th.

Gladehound

It all depends on what you're pulling and how.

travel trailer (6,600 GVW, typically ~5,000 when traveling, 27ft, ~60 sq ft frontal area)

• 11.1 MPG on 3000 mile trip (lots of hills, some winds, cruise speeds typically 60 - 70 MPH)
• 12-13 MPG at 60 MPH cruise on rolling highway with no wind
• 22 MPG at 30 MPH flat road steady state

Flat bed 2000 - 4000 pounds

• 16 - 17 MPG on 24 mile round trips to home depot

Log splitter (not sure this really counts as towing)

• 21 MPG bringing it back from my dads place ~10 miles country roads with hills and stops 40-50 MPH.

Flat bed with 9 foot tall tractor ~9,000 pounds.

• 9 MPG on country roads.

In theory, a 2.7EB should get the best MPG up to a certain load, beyond that a 3.5 EB should get the best MPG up to a certain load, beyond that a 5.0 should get the best MPG. I have no idea where those cut off points are or even how to define them because there are so many variables including how you drive.