Very strange mileage observation - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 06-03-2012, 07:40 AM Thread Starter
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Very strange mileage observation


I recently got back from a 1000 mile trip with our 2001 F350 7.3 PSD automatic and experienced something strange.

When accelerating extremely slowly, like when hauling a few loose eggs in the truck bed (read: babying it), I get 10.5 mpg and when accelerating fast, the mileage rises to at least 11.5 mpg. (semi-hand calculated by an iPhone app)

Shouldn't that be the other way around? Could there be something wrong? Any ideas?

Thanks for the info,

FYI: I was hauling a truck camper to get this kind of mileage.
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post #2 of 6 Old 06-03-2012, 08:10 AM Fanatic
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Here is my theory with fuel mileage. The longer it takes to accelerate the vehicle the worse the milage will be.(to a certain degree). We get the best mileage when we are at our cruising speed. Not during acceleration. So when it takes say 15 seconds to get to 60 instead of say 10 seconds i think the milage will be worse. Again its just a theory.

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post #3 of 6 Old 06-03-2012, 06:47 PM
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The truck will be more efficient under some boost.... let her get in a few lbs at least and I bet thats the best way to accelerate overall..

00 F250 XLT 4x4 7.3
5" Turbo Back
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post #4 of 6 Old 06-03-2012, 07:07 PM
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It's such a small variation especially semi hand calculated with too many other variables.

2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
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post #5 of 6 Old 06-04-2012, 02:02 AM
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I'm betting on a head wind for the 10.5 mpg! lol


2000 F250 PSD SCSB 4X4 418k miles straight pipe gauges 2" leveling kit 315/75r16's
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post #6 of 6 Old 06-04-2012, 03:15 AM
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Keep experimenting and see what you find. Like others said, that's a small enough difference that it's probably unrelated to your acceleration differences

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Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
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