Here's the totals so far at 5020 miles on the odometer:



Notes:

• 4 tanks used in purely towing. MPG: 11.02, 10.57, 10.37, 11.73
• Best tank mileage: 18.02 (Mostly freeway, some city)
• Worst tank mileage: 10.37 (Pure towing, hard, uphill, into the wind and high elevation)
• So-called Lie-O-Meter is pretty truthful at 99.81% accuracy. I compare actual fuel used with the Trip B reading which has never been reset since truck rolled off the line at KTP. The lie-o-meter needs a new name and some respect. Over time it is turning out to be extremely accurate.

Anyone else keeping data?

 

That seems pretty consistent with what I am getting in similar conditions so far. I live about 600 metres higher than the valley so going down is great but coming up pegs my instant fuel economy meter at the max (off the charts) - I've learned to ignore it.

Funny thing, our instant fuel economy graphic is inverted to yours so where in the US, more green = good, here it is bad. But it sure is purrtty coming up the hill...

 

Nice presentation. I am keeping track but not with that much precision. I also use the trip meter. It is also nice to see that I am not the only one who uses the fuel computer. I have found it to be pretty accurate as well.

 

GREAT report! Fantastic details...

Epic -- One question: Did you update the trucks computer with your NEW larger tire size? It's something only the dealer can do (at least on the previous generation SuperDuties). If not, then your mileage readings might be off...

Thanks!
biz

 

I have kept the main screen un-reset(is that a word?), I use trip A for trips, and trip B for each fuel fill up.

City running around I'm getting 14.4 worst to 16.2 best. I think the continuos one is at about 14.6, I've had one 1500 mile road trip unloaded that helped a lot, and one 2000 miles road trip averaging 87 mph that hurt a lot. Not much towing yet, just to the lake camp ground.

 

Larger tire diameter will affect the odometer accuracy and your fuel economy accuracy as well.

Epic,
What would your avg fuel economy be if you removed the towing fuel economy samples?

 

A lot of the programers will reprogram for larger tires. It's not a dealer only option. It was one of the reason I had the Edge Evolution on my 2006 truck. I never turned the power up, ran it in stock mode the entire time I owned the truck, But I did reprogram for the Toyo 285/75r18 tires that I put on.

 

No power adders are out for the 2011 fords yet.

 

I have not compensated for the larger tire size. The Toyo's are approximately 3% larger in diameter so you could factor that into the results.

I adjusted the low mileage tanks to equal 15mpg each and it changed the overall average to 15.78. Pretty big difference. I have to go back and check my logic in that assumption though. I'll try a couple of different scenarios tomorrow.

 

What we are interested in here is the RPM (revs per mile) by tire.

Toyo MT LT315/60R20 = 593 RPM

OEM tire = ???

Which could result in the 3% you speak.

Again...I am going off the generation 1 ('99 - '04) SuperDuty way of doing it. I am planning a 2012 model year as soon as they arrive.


biz

 

My absolute record is 23.4 but not for very long.
That was flat terrain, 50 MPH, gear 6 and cruse control driving so very controlled conditions. For anyone who has traveled the Natchez Trace, this wouldn't be impossible empty. I would have a hard time reproducing that high number most of the time.

This picture shows 22.5 and is mostly where it stayed for 40 miles during a 104 mile drive.
I was not towing anything but had 6th locked out and was in T/H mode.
I'm sure it would have been a little better had I allowed 6th.
I was experimenting. My max speed was 60 with two 45 MPH zones as I traveled through small towns. I was impressed.

With a 2 ton tractor and 18 ft equipment trailer, I max out in the mid 12's which is still decent. I think it's safe to guess the 3.31 has a little more fluctuation related to MPG empty vs towing over the 3.55 but someone can gladly provided a more educated answer.
I'll calculate per tank some other day.

Yes I know, the TPMS came on. I checked and my PSI was fine so IDK what it keeps fussing about.

 

I am leaving today for a couple of days with my fifth wheel in tow. It is the first tow with the new flash. I am interested in seeing if I can really tell the difference.

 

Definitely interested in mileage and power delivery Ric - good luck!

 

Thank you very much, this is the kind of fuel mileage report needed to make a proper discussion to buy a 2011 or keep the 3 SDs I have. I was hoping for a lot better number though. It looks like I should keep the 01,05 & 06!

 

I'll possibly buy one of them.