Join Date: May 2014
Mentioned: 1 Post(s)
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Hey some more data for what its worth
Did the Sanford Maine to Concord NH trip
all state hwy. twisty turny rolling terrain
moderate traffic 50 to no more than 62 mph
no wind 52.9 miles 18.0 MPG quite a surprise.
I was easy on the gas and not in any kind of a hurry.
Thanks for doing the slower trip to guage the milage difference. With your report and others, unless it is a strong headwind, it appears the difference in mileage, is not the axle or height, but the mph over 65.
Reinforces what a lifetime of driving has taught us all.
SF, there are many variables which affect MPGs, speed being just one. Generally slower is better, but only to a point.
Size, weight, engine size, gearing, etc... also matter. A big and heavy RV at 50 MPH will still get low MPGs, so speed alone can't overcome other factors. The same goes for gearing. Taller is generally better, but only to a point. Exceeding the optimum for a given condition has adverse effect.
The important thing to know is that it's not so simple that it can be isolated to one best speed, one best axle ratio, etc. it doesn't work that way because pretty much every variable interacts with other variables. For example, the optimum axle ratio for one engine size is not the same for another engine size, assuming of course that other conditions are the same.
Some variables are almost always advantageous, like lighter weight, more aero, smaller area, lower friction, etc. But when it comes to comparing powertrains, extending a trend in one direction has limits. The obsession some have with 3.31 makes little sense to me. It's not a cure to everything in order to improve fuel economy.
Doesn't matter how you have your Transit configuered or loaded, you will get better mpg at 65 and lower than you will above that. Owners are already proving that with their posts.
BTW, he has a 3.7, not a 3.31.
Mileage computer tells me I'm getting 14.8 - 14.9 mpg. And it's the same whether I'm driving at 60, 65, 70 or sitting perfectly still, idling in traffic! Not a lot of confidence there.
Last weekend we took the iron tent camping in the desert of So. Cal. Roughly 180 miles round trip, including slow, winding back roads and 65-70 mph highway. Filled up before and afterwards and got 14.6 mpg.
Go figure. Apparently the system is clairvoyant.
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