How's this possible?

[sy1616]

Everytime i get gas i hand calculate total mileage since last fill up divided by total gallons filled. For the last 26k,since new, ive been getting 11.8-12.9 but the last two fill ups show 15.1 mpg and today 16.1....... Huh? Not complaining but that's huge. Just finally breaking in? Did the math three times, no errors.

[JBB1970]

Maybe you topped off with a little more fuel than previously? I have almost always got between 15-17 mpg on my truck. I also just about always stuff as much diesel in my tank that I can get. Don't know if that makes any difference or not.

[sy1616]

Originally Posted by JBB1970

Maybe you topped off with a little more fuel than previously? I have almost always got between 15-17 mpg on my truck. I also just about always stuff as much diesel in my tank that I can get. Don't know if that makes any difference or not.

No, I use the same pump everytime. As soon as it clicks off I note the gallons filled, that's the number I use. THEN, top it off which is generally another 3.25 - 3.50 gallons...to the brim so it's right. I'm happy, gotta love a 40%+ increase overnight without having to tune it!

[smotrs]

I top mine off at the brim every time and that's the number I use. The reason why is because the fuel can foam and the amount of foam it has can impact the shutoff on the handle. Different grades of fuel (winter vs summer blend) can also change the foaming action as well and impact the shutoff.

[Barry Smith]

Filling to the brim is the only way to really get the right number.

[sy1616]

15.8 third tank...loving it! Runs perfect.

[Alberta Advantage]

Originally Posted by sy1616

Gotta love a 40%+ increase overnight without having to tune it!

Your engine must be broken in....



Awaiting the sh*t storm that this comment will generate.

[08spartan250]

I'm thinking you were able to put more fuel in on the past few tanks. I mean trucks just don't decide to get better mpg. Did you just replace the fuel filters? There's always some logistic for something like that. It won't just change. I put 25k on my 6.4 and the only two times my mpg went up was 1)DPF delete and Spartan 2) took the 8.5" lift off to stock height.