How's this possible? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 10-04-2011, 04:17 PM Thread Starter
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How's this possible?

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.
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post #2 of 8 Old 10-05-2011, 02:23 AM
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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.


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post #3 of 8 Old 10-05-2011, 11:40 AM Thread Starter
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Originally Posted by JBB1970 View Post
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!
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post #4 of 8 Old 10-05-2011, 01:51 PM
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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.

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post #5 of 8 Old 10-06-2011, 05:11 PM
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Filling to the brim is the only way to really get the right number.

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post #6 of 8 Old 10-10-2011, 06:50 PM Thread Starter
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15.8 third tank...loving it! Runs perfect.
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post #7 of 8 Old 10-10-2011, 07:19 PM
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Quote:
Originally Posted by sy1616 View Post
Gotta love a 40%+ increase overnight without having to tune it!
Your engine must be broken in....



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post #8 of 8 Old 10-11-2011, 06:37 AM
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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.

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Originally Posted by azkcr View Post
And you didn't know Cummins can manage 127mpg??? They also deliver babies, go to Mars, and cure AIDS. DUH
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