Mileage

deltabravo wrote:
They display is always slightly different than the hand calculated, some of which can be attributed to a slightly different level of "how full did I get the tank this time compared to last time." There's too many variables involved to get a fuel tank filled to the exact same level each and every time.

The display does not use the fuel level in the tank to calculate mileage, it reports the amount of fuel injected in the miles since last reset. The variations are caused by less than perfect injection systems and odometers. There is always a tolerance, nothing is perfect.

Fuelly has the f250 7.3l at 13.4
F250 6.7l at 14.2

drittal wrote:
I hate these, "what mileage can I expect" questions.

How do you drive? Do you keep up with traffic from Stop light to s.l. or race it, or let it pass on by? Do you drive 65, 75, or 85?

Where do you drive? Congested freeways, 80 mph interstate, or 55mph rural highways?

Stock wheels and tires or plan on going bigger and more aggresive?

The best I can say is go to Fuelly and compare the 2. If you see better mileage than the Fuelly numbers on your old truck, you can probably see a similar improvement on the new truck.

There are lots of variables for sure. Region matters too. Running up and down the grades out west is going to burn a lot more fuel than the flat midwest or the eastern hills.

I hate these, "what mileage can I expect" questions.

How do you drive? Do you keep up with traffic from Stop light to s.l. or race it, or let it pass on by? Do you drive 65, 75, or 85?

Where do you drive? Congested freeways, 80 mph interstate, or 55mph rural highways?

Stock wheels and tires or plan on going bigger and more aggresive?

The best I can say is go to Fuelly and compare the 2. If you see better mileage than the Fuelly numbers on your old truck, you can probably see a similar improvement on the new truck.

mtofell1 wrote:

Lynnmor wrote:
Mileage won't change due to break in, that's an old wives tale.

X2 - I totally agree this is one of the most overstated tales told. And before you all chime in - I'm sure your father-in-law's neighbor's gardener got 4mpg better with his truck after 100K :) :)

I could maaaaaaybe believe a very minor improvement after the first few tanks as things got broken in. Like something in the neighborhood of .2 mpg. I don't even know how someone could track it.

I think it's a case of optimistic calculating when people see some crazy improvement on an older vehicle.

Dang this is one of the classic interwebs truck arguments and I don't think I've seen it yet on rvnet!
But yeah, and to top it off, I don't think the avg mileage varies that much from year to year and brand to brand as made out to be, save for the 1st gen dpf trucks use considerably more fuel to re gen. Affecting overall mileage.
Pretty much every diesel pickup I've owned or driven enough gets 17-18 mpg avg, plus or minus 2 for conditions, speed , etc.
And never saw that magic mileage jump on any diesel at 10k, 30k, 100k, whatever is being claimed.

Cummins12V98 wrote:
I would think one would ask that question BEFORE buying a truck.

unless fuel mileage isn't on the top of the list as far as wants and needs go

16-18 on the highways empty.

8-10 on the highways pulling the camper.

mileage is important on a new truck for a while for me but then it is what it is and the roads etc make a big difference. Until 2009 our dic was perfect for fuel used and mileage. Perfect means the math agreed. Good enough now but a speedometer repair changed the numbers a little. I do heard of some big numbers from guys .

chevman

I would think one would ask that question BEFORE buying a truck.

ShinerBock wrote:
OP, I would ask for hand calculated numbers only. A lot of times people like to give you the mileage on the computer which can be one or two mpg's off from actual hand calculated numbers.

Ditto.

I track MPGs of the DIC and hand calculated on all 3 vehicles I have owned that had a MPG display. They display is always slightly different than the hand calculated, some of which can be attributed to a slightly different level of "how full did I get the tank this time compared to last time." There's too many variables involved to get a fuel tank filled to the exact same level each and every time.