Very strange mileage observation

[Mark_be]

Hello,

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,
Mark


FYI: I was hauling a truck camper to get this kind of mileage.

[i_gibson13]

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.

[00SVTStrike]

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..

[jesilvas]

It's such a small variation especially semi hand calculated with too many other variables.

[Turbostang500]

I'm betting on a head wind for the 10.5 mpg! lol

[atvrider93]

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

Sent from my DROID BIONIC against my will