Join Date: May 2019
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I've got a 15 F350 SRW. 3.55 Rear end.
Bear in mind I've only had the truck about 2 Months, but have put about 4K miles on it, pretty even mix of 5th wheel towing, Highway, and city Driving.
City, I average about 10 - 11 mpg. But I have a heavy foot.
Towing the 10K lb 5th wheel, I get between 9.5 and 11.5 at 65 - 70 mph. Depending on where a regen falls when I check my mileage. I could maybe push 12mpg towing if I kept it at 60 and didn't have a regen.
Highway unloaded I have the least info on, but i've got 17.5 on one occasion and 16 ish on another.
I had hoped for better economy, but thats just the nature of the beast.