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I rented a 2015 Transit 250, 3.7 gas, medium roof, medium length with 8k miles on it from Enterprise. The only unknown is the rear end, but would assume it would be the 3.73. The cargo van was loaded from front to rear of medium weight and driven from Dallas TX to Grass Valley CA through west TX, New Mexico, Arizona, Nevada, into California, and the same return.
In manual calculations of mpg over the 3800 mile round trip we got 14.5, 16, 16.2, 15.2, 14.9, and 15.35 for an average of 15.358. To be honest, I was somewhat disappointed, but in fairness to the vehicle, the speed limit out there is mostly 75, and we often drove 80+. In addition, there are many elevation pulls out there plus intermittent high winds. The only other variable was one fillup at 85 octane and one at 86 instead of the normal 87.

Sooo, now you have a real good report on how the 3.7 performed under these conditions. My question to the forum would be how the Ecoboost would have done on the same trip??? it would also be interesting to hear what the forum members think how much the 3.31 rear would have saved over the 3.73?

If anyone would like to know our overall opinion, read on. When I picked up the Transit empty at Enterprise, I could not believe how noisy and rough riding the van was, but once we got it loaded it was quiet, smooth, and comfortable. The seats were supportive on the long drives and the visibility was great. The cargo area and doors were user friendly. In anticipation of buying a very similar unit, I was very pleased with almost everything. For the long hauls a larger gas tank would have been helpful. The biggest surprise was the power of the 3.7. I was expecting to spend the $1800 extra to get the Ecoboost, but I found the 3.7 to be very satisfactory and it worked smoothly with the transmission. We had been renting Chevy cargo vans with V8's for the same trip, and found this to not downshift so drastically on the steeper grades. If the Ecoboost did not provide better mpg, I would see no need to upgrade to it for more power. If your loads are heavy, you may feel that need.
 

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Welcome to the forum Eureka! A rental 250 might have actually had the 4.10 rear end IMO. Also, speeds over 60-65 seem to affect MPG greatly, especially in the 75-80 MPG range.

Because you posted in the Mileage and MPG sub-forum, I assume you have seen the other MPG threads which discuss the various engines and rear ends? FYI here is the list of those threads:

http://www.fordtransitusaforum.com/ford-transit-mileage-mpgs/

In particular, these threads for the 3.7 offer lots of information:

http://www.fordtransitusaforum.com/ford-transit-mileage-mpgs/6137-mpg-3-7l-transit-wagon-van.html

http://www.fordtransitusaforum.com/...1642-mpg-3-7l-4-10-axle-few-other-things.html

Thanks again for your detailed post.
 

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....cut.....

Sooo, now you have a real good report on how the 3.7 performed under these conditions. My question to the forum would be how the Ecoboost would have done on the same trip??? it would also be interesting to hear what the forum members think how much the 3.31 rear would have saved over the 3.73?

......cut..... If the Ecoboost did not provide better mpg, I would see no need to upgrade to it for more power. .....cut.....
For comparison purposes, Ford tests under controlled conditions should be more accurate than fuel economy reports posted here which are all over the map. Not that that is not expected since we all drive differently, under different conditions, and different terrain.

Ford claims that both the 3.7L V6 and 3.5 EB get approximately the same 14 city and 19 highway in low- and medium-roof vans. So regardless of how different these MPG numbers are from "real world" results, the two engines should be on par when driven similarly.

In real life EcoBoost engines are often driven harder so fuel economy is lower.


P.S. -- The 3.31 ratio is not available with 3.7L naturally aspirated V6 so the Ford results already take the gearing difference (3.73 vs. 3.31) into account.
 

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That's about right for much over 70-75mph. It's easy to get around 19mpg or possibly more if you have long stretches at 35-55mph. The windage makes the engine work a lot harder much over 65mph. I tend to not push it past 60-65mph if I want good economy. That said, considering the size of these things 15mpg doing 80mph isn't terrible. Just a few years ago similar size camper vans were getting 10mpg averaging 60mph.

On long stretches with cruise control I generally get the following:

55mph - 18.5-20mpg
65mph - 17mpg
75mph - 15.5-16mpg
 

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Just as a comparison, I did about 250 miles today in my long tall 3.2 diesel with 3.73 rear end with about 1500-2k lbs of tools and materials in the back. Rolling hills, 75-80 mph for most of the trip. I reset the trip 2 computer and got 15.8 mpg. I think the tall roof height makes a big difference in mpg at speeds above 70 mph. I can feel that the natural speed of the van wants to be around 70-75 mph, and not much above that, but I was going skiing and wanted to get there, get some runs in and get home in good time, so I was going with the flow of the passing lane.
 

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Just did a 1200 mile round trip,
I averaged just over 16mpg.
That's exactly what I get in my '04 F-150, 5.4 V8...with a girlfriend and about 600lbs worth of gear in the back. From Denver to southern Utah.

Funny thing is, I get 17 coming back.

A lot of people seem to really like that 3.7...I had the Essex V6 in a 2001 E-150 and that thing was a dog!!! It soured me, man. Turbos? Yeah, gimme those.
 

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3.7L torque

re: A lot of people seem to really like that 3.7.

I do people harp on the fact that max torque of 260 foot pounds comes at 4,250 RPM. No one ever mentions that you have 225 foot pounds -- 86% of 260 -- at 2,000 RPM and 245 foot pounds - 94% of 260 -- at 2500 RPM and then the curve is essentially flat at 245 foot pounds until nearly 4,000 RPM.

Entering the freeway today, via a tight downhill 180-degree hairpin approach ramp signed at 15-MPH speed limit, the run up lane is short. I had to stop and wait until I could see an opening coming in my rear view mirror. I accelerated normally while watching my tachometer. It appeared to shift at about 2800 RPM and I quickly and smoothly got up to 65 MPH and merged into the space in the lane. My 148 MR 3.7L 3.73 LS cargo has only a bed and a toilet and couple of water jugs riding with me right now so it is essentially empty.

Greg Hayden
Vista, CA USA
 

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Greg is right about the torque.
Posted this elsewhere. I've calculated better average mileage on a very long trip. With the same vehicle Greg has, I average 17 around town at home (under 30 mph). Traveling, there was little difference between 65 or 80 mph, see below.
Bare cargo van with 2 options, cloth seats and limited slip.


Delivery May 9, 2015. 3K break-in miles through Northern California mountains. No calcs.

Then 20K miles in three months, San Francisco, CA to southern Nicaragua, north to Montana, back to San Francisco.
Cruising speeds 65-85 with lots of stops (speed bumps).

Mileage, calculated by hand, ranged from 19.5 mpg - 21.5 mpg. Normal load 1,500-2,000 lbs.
Stock tires at 35 psi for ride.
Hauling in Nicaragua, added 2-3,000 lbs here and there, with higher tire pressures. Idling at the beach for the air not included.

No problems, no body or other noise yet, even on the hellacious central american speed bumps. Even tire wear, rotated once.
Great truck except for the rough ride when it's rough. Limited slip works very well, if traction control is turned off. Used it a lot.

Comments in some threads about revving the 3.7 I don't understand..
This 3.7 much better liked the auto setting staying at lower rpms, in the grunt, for keeping up high speed.
It ain't sexy but I no longer put my foot in it either.
Spent days and days at 70-80 mph through the mountains with the crazy Mercedes truck and suicidal bus drivers in Mexico and Guatemala, and other places too dangerous to mention.

Lost the right mirror from it's roots to a parked semi. Duct tape and a shaving mirror made it home.
$500 replacement at my California body shop. On the third windshield now, but all from rock damage on California freeways.
 
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