High Roof vs Mid Roof hwy MPG - Ford Transit USA Forum
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post #1 of 12 (permalink) Old 07-27-2014, 01:33:PM Thread Starter
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High Roof vs Mid Roof hwy MPG

Dry camping in the rain today so plenty of time to ponder the Transit order.
Despite Ford's claim that the mid and high roof versions get the same city, highway, and combined mpg (according to their un-official released info) there must be a penalty to the higher roof. Any educated guesses as to how much an mpg hit the high will take at 75 mph level terrain calm wind cruise?
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post #2 of 12 (permalink) Old 07-27-2014, 04:24:PM
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Since the frontal area is less than 10 percent greater than the mid-roof, and the final gearing (depending on engine choice) is in the range of 10% lower at most, I'd guess no more than a 10 percent penalty.

So if highway rating is around 19 MPG for low and mid roof vans, then I'd guess no worse than 17 MPG highway for high roof. Just a guess though.
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post #3 of 12 (permalink) Old 07-27-2014, 05:02:PM
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P.S. -- I'm not sure EPA rating is achievable at steady 75 MPH, so I really meant to say about 10 percent less than what a mid-roof would get at same 75 MPH. In any case I'd guess in the range of less than 2 MPG difference.
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post #4 of 12 (permalink) Old 07-27-2014, 05:25:PM
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i've asked myself the same question.
And for our proposed use (a rig that could be used as a primary home-on-wheels for extended adventures...months on the road)... I think we would appreciate the extra ~2 feet of extra length the Extended WB would give over the Long WB's 12 feet behind cab, so we'd be stuck with the High Roof. That and i know there would eventually be a roof rack with solar panels and at least one MaxxFan up there. And if a roof rack? might just want to put the two Fiama awnings (i would order the van with dual sliding doors utilizing both sides in camp) up on the roof to keep the sides clean.

...So a rig like that will get a MPG hit. I know our van conversion went from ~19 hwy stock to ~16 with high roof (added 24") and the fiama awning + maxxFan on the roof. It hurt, but it sure is nice to have over 6 feet of headroom inside a daily driver/adventure rig! I figure anything over ~14 to 15mpg and i'm ahead of the game over current rig since that is what we see with only 9 feet to work with behind the cab...so the ~14 feet would be welcome.

Cheers, and best wishes on the planned van-build.
Thom

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post #5 of 12 (permalink) Old 07-27-2014, 06:18:PM
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that is why I am getting a L.R if the powertrain is Identical. their should be at least a 3 MPG difference between low and high
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post #6 of 12 (permalink) Old 07-27-2014, 08:55:PM
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The extra room/space provided by the high-roof extended van would be hard for me to pass up on for a camper conversion. However, I also want the highest practical miles per gallon so the extra height comes at a cost.

My personal compromise is planning to drive slower in order to offset the extra roof height drag. If vehicle drag is increased by say 10% (just a rough guess on my part), then driving about 5% slower will reduce drag by the 10%. And if instead of driving at 75 MPH I have to drive between 71 and 72 MPH to get same fuel economy, that's a trade I'm willing to make.

For my typical camping trip, driving a little slower would represent less than an extra half hour on the road per day -- on average maybe 10 to 15 minutes at most. The extra living space would be well worth it for us.
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post #7 of 12 (permalink) Old 07-28-2014, 07:47:PM
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...And if instead of driving at 75 MPH I have to drive between 71 and 72 MPH...
HaHa! I'm so glad my wife is not part of this conversation. She would want to reach out and give you a hug. She is totally into maxing out the speedometer every time we hit the road. She is the type A personality that i attempt to mellow out with my type B. She is petal to the metal, and i'm mellow at ~60 smelling the roses. I've shown many, many times that the difference is _maybe_ at most 30 minutes we get into camp doing ~70. Plus, actually, in our case, our trailer's tires are rated at 65 mph. I think if we were to have an accident doing ~70+ our insurance agent might not find favor with us?!

Happy Trails,
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post #8 of 12 (permalink) Old 07-29-2014, 03:32:PM
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Any remote possibility that Ford would release Cd figures for various Transit configurations? If not, did MB/Sprinter ever release theirs? (Just for back of a napkin calculations)
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post #9 of 12 (permalink) Old 07-29-2014, 04:19:PM
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Any remote possibility that Ford would release Cd figures for various Transit configurations? If not, did MB/Sprinter ever release theirs? (Just for back of a napkin calculations)
I'd guess pretty good possibility, but only if the Transit is lower than competition.

I've seen Cd numbers quoted for the ProMaster and also the frontal area for both the low- and high-roof models. They seemed rather low to me so I questioned their accuracy. As I recall the Cd was under .40. A little low for a van in my opinion -- but hope it was right.
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post #10 of 12 (permalink) Old 08-28-2016, 11:04:AM
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Accrete-since I notice your Chevy on the Fiberine site, have you seen the 30" XLT lift yet? Know where this info should be posted for the site? If so, pls do. Thanks-HS (ps-pic not me)
http://www.fiberine.com/GVMR/Full_Size_Van_Tops.html#0
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