MPG for 3.5 with 3.73 - Ford Transit USA Forum
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post #1 of 123 (permalink) Old 02-16-2015, 12:40:PM Thread Starter
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MPG for 3.5 with 3.73

I filled the van yesterday for the first time since purchasing in January. The trip meter showed 16.1 mpg. It took 21 gallons for 321 miles, 15.3 mpg. I do not know how full it was when we took delivery. I will post more data as soon as I have it.
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Marvin
Newberg, OR
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post #2 of 123 (permalink) Old 02-27-2015, 01:48:PM
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My 3.5, 3:73 is yielding the following after approx 2,000kms,....(1240 miles) using the on board readout.........mostly local traffic,(40-60mph) very little stop and go, basically no load in the back.

13.2 Liter/100k (62miles) divided by 4.5=2.9imp gals=21mpg in Canada
13.2 " " " 3.8=3.5 us gals=17.7 mpg in U.S.

This might improve with more mileage. Haven't tried towing the trailer yet!

Cheers,
Dave.
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post #3 of 123 (permalink) Old 02-27-2015, 02:00:PM
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Excellent results IMO. Your towing results will be interesting, especially compared to your old tow rig, as the new Transit's roof line seems to match your trailer better.

trailer/van pictures

Small trailers

2015 XLT 150 Wagon, 3.5EB/3.31LS, 130" WB, low roof, 8-passenger, full trailer tow incl. brake controller, ordered 12/14, delivered 4/20.

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post #4 of 123 (permalink) Old 03-08-2015, 03:10:PM Thread Starter
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We covered 685 miles using 40.6 gallons over the last two fill ups, yielding 16.9 mpg. The trip meter appears to be about +1 mpg off.
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Marvin
Newberg, OR
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post #5 of 123 (permalink) Old 03-08-2015, 05:04:PM
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At 3000 miles I feel comfortable giving my mpg results. My average is 13.5. The last tank was only at 12.5, with bitter cold and a good bit of warmup idling to melt ice off that half acre windshield. My van is loaded with very little of what you would call highway driving. Will be interesting to see what warm weather does to mpg.
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10360 gvwr, high roof, el, 3.5eco, 3.73 axle,
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post #6 of 123 (permalink) Old 03-13-2015, 05:51:PM
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mpg update

Transit 250, med roof, lwb, 3.5l ecoboost w/3.73 ls

4500mi now, mostly towing 7×16 box cargo trailer

16-18mpg empty, mostly hwy(non towing )

12.5-14mpg towing

About 90% of miles towing...so feel more confident in those figures.

Nate
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post #7 of 123 (permalink) Old 03-15-2015, 12:12:PM
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Quote:
Originally Posted by Nathan Green View Post
Transit 250, med roof, lwb, 3.5l ecoboost w/3.73 ls

4500mi now, mostly towing 7×16 box cargo trailer

16-18mpg empty, mostly hwy(non towing )

12.5-14mpg towing

About 90% of miles towing...so feel more confident in those figures.

Nate
Nate, excellent fuel economy data for both towing and non-towing.

Suggests to me (more like confirms) that 3.73 can be as efficient or more so than 3.31 in some cases.

Your driving style probably helps a lot too. Nice job.
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post #8 of 123 (permalink) Old 03-18-2015, 10:53:PM
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My best guess is the 3.73 is about 1mpg less than 3.31. My dash display mpg is about on target...always within .5mpg towing or not.


I only have 2 tanks non-towing...so need more data to make any conclusions there, but--


1. MPG is highly dependent on winds(head, tail, or side).
2. MPG with transit is dependent on temperature(warm temps==better mpg)


Disclaimer: most of my driving done in long jaunts on the interstate. I am an expediter, so I can clock 600-700mi a day for cross state/country journeys. I use cruise 95% of the time. I am extremely light on the throttle and use the whole off ramp to coast to slow(try not to use brakes if I don't have to).
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post #9 of 123 (permalink) Old 03-19-2015, 12:27:AM
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Thanks for the updates Nathan. Any chance of a side photo showing your rig with the trailer hooked up, for height comparisons, or a comment on how the medium roof van and trailer tops align? Nice work on the throttle and brakes IMO.

What was your previous tow vehicle if any, and are you happy with your MPG? If you had the time to order a new Transit, do you feel that the 3.31 rear end would work for your needs, or does the 3.73 give you a margin of power/gearing for the loads you have to move? I assume that most of your highway miles are in 6th gear -- what speed and revs. would you say are the norm?

If possible could you also give us an idea of your total van and trailer weights loaded?

Thanks again, and sorry for all the questions . . .

Peter

2015 XLT 150 Wagon, 3.5EB/3.31LS, 130" WB, low roof, 8-passenger, full trailer tow incl. brake controller, ordered 12/14, delivered 4/20.

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post #10 of 123 (permalink) Old 03-19-2015, 10:47:AM
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Originally Posted by Nathan Green View Post
My best guess is the 3.73 is about 1mpg less than 3.31. My dash display mpg is about on target...always within .5mpg towing or not.

....cut....
If you're only getting 12.5 to 14 MPG while towing (90% of miles) on Interstates, it's doubtful you'd do much better. Your engine is already working under significant load.

With EcoBoost technology once the engine is under boost, adding more boost doesn't make it more efficient. So increasing gearing under those conditions will just make engine run slightly slower with higher torque (to produce same horsepower) but doesn't make it run more efficient.

When running empty and getting 18 MPG, taller gearing may help a little, but not as much as some think. The difference in gearing is less than 13% after all.
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