WXBoy,

Fuelly is a great site to get a general idea, the problem is that it doesn’t differentiate how people are using there trucks. Are they running empty everywhere in a flat state or are they hauling for a job site in the city or towing in the mountain west? If you look at the graph there can be a wide range of variation.

I think that’s why a forum like this is useful because it can show people the mileage they are getting for a specific application.

I haven’t used Fuelly but I hand track my mileage, since it’s a new truck and I was really curious. Had I input to Fuelly my average over the lifetime would be just 9.0mpg. That’s with just 4000 miles on it but 3000 of those have been towing my travel trailer setup, which I’m only averaging about 8.2 mpg with. So I’d bring the average down, since there are only 6 F-350 7.3s listed there.

I agree, I expected a little better efficiency. I averaged just under 10 mpg towing the same setup with my F150 3.5 Ecoboost that was always in the turbos to keep it moving.

 

I think when the data set gets larger Fuelly will give us a better idea of mpg. Problem right now is there is so little data with any of the 10 speeds you can’t reach any conclusion.
I know this is data entered by users-who you hope would be truthful. But there are a couple of flyers in there that post some numbers outside the curve...enough to make you say “hmmmm”. Maybe they always drive unloaded, downhill, and with a tail wind both ways.

 

I responded to a MPG question for the 7.3 on another forum the other day. I gave some small sample numbers from this thread, admitting it's a small sample, and really the engine is so new, you don't have a lot to go on. Some other dude makes a couple cracks and says you'd be better off with a GM 6.6 gas.

So I went to Fuelly, where I am tracking my F150. I got basically the same info as above: 7 F250s over 26,000 miles are averaging 12 MPG.

Then I put in for GM trucks running the 6.6 gas and found: 9 Silverado 2500 HD models with the 6.6 gas reporting 11.1 MPG over 42000 miles. And 1 GMC Sierra 2500 HD with the 6.6 gas getting 12.9 MPG over 5300+ miles.

So the GM dude hasn't posted again, even though the thread is 4 pages now, 3 more than when I posted.

One thing though, I do agree that Fuelly won't tell you how the vehicles are driven. Or where, speed, hills etc. Or what your steady state flat, smooth road numbers will be. Everybody remembers the first time they drove a vehicle with the MPG display, and how proud they were to be getting 99 mpg going downhill. Well, everything gets good mileage when you're going downhill, almost everything gets good mileage on the flat at steady speed. If you only had to pay for the gas under those circumstances, those numbers would be important. But you have to pay for all the gas, the cold start gas, stop and go, hills, loads, towing, stuck in the drive through. And you'll be paying for gas at about 12 mpg with a 7.3. Give or take, ymmv.

 

See, I actually view it differently. Over time, as thousands and thousands of miles rack up across the nation, all the extreme cases get weeded out by the averaging. Some guys might drive 45 MPH roads in Eco Mode constantly and see 16 MPG. The next guy might tow heavy machinery constantly and see 8 MPG. At the end of the day, once there are hundreds of these trucks logging millions of miles, the numbers will all come out in the wash. It'll average out, and the figure you see on Fuelly will be spot-on what the average guy can expect to get with the truck.

I've bought/leased way more trucks than I should have and I've found Fuelly to be much better for research/planning than the window sticker EPA data.

 

I'm settling in at 14.5mpg mixed driving w 91 octane and around 9.3mpg towing (less if I use 89 octane). This is after 13.6K of miles.

 

At 20k miles I'm right there with you. I'm right around 12+ in town and 15+ on the hwy. I'm very pleased with this as it is better than my previous 6.2s.

 

I,ve hit 10,000 km or say 6200 miles no towing but mixed hwy/ town no commuting and I have averaged 14-15 mpg u.s. Sure is hard not to roar around all the time as this Tremor with 7.3 and 4.30 rear likes to go.

 

Color me impressed, folks. I never expected the 7.3L to do as well as the 6.2 despite the grandiose claims when they released it. I was wrong.

I haven't had a Super Duty in almost a decade, but when the time comes the 7.3l will likely be under the hood.

 

In my fleet of company pickups are many with the 6.2 and the new 7.3, as best as we can tell, get identical fuel mileage.

 

Are both the 6.2’s and 7.3’s ten speed trannys?

Thx.

 

In 2020, yes

 

No. Post needs to be longer...

 

2020 F350 7.3 3.55 Gears
5000 kms
20.6 L/100KM lifetime

Good mix of light towing and short gravel Road commutes with a couple Highway trips.

For reference my 2016 F-150 Ecoboost with the same type of driving, Lifetime on it was 19.5 L/100KM

 

So the bigger truck and engine, barely use any more gas than a smaller truck with v6...interesting.

 

It would be different if I did more empty highway driving, but I don’t.