Drive for mileage
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Junior User
Joined: Sep 2010
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From: Northern Illinois
Drive for mileage
Here’s the photo of the LOM (lie o meter25.8 mpg) it helps to draft a semi trailer with a 20 mph tail wind. This was a great feeling – This fuel mileage test was right after the latest recall flash; BP fuel – no bio - $4.04 per gallon – total miles driven were 307.6 - of which 189 were interstate and 118.6 in-town. Hand calculated mileage for the total tank was 15.17 mpg. Truck is stock – 08 F250 with 3:73. Given the power and weight of this truck – I’m satisfied – as much as I can be – until tune & delete<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
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Junior User
Joined: Sep 2010
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From: Northern Illinois
Remember that the 25.8 was for the perior of time that I was draftng that semi - Strickly interstate driving I have reache 19 mpg - but I drive for mileage - around 62 to 64 MPH - there are many times I'll slow down rather than pass.
Posting Guru
Joined: Jul 2005
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From: San Jose, CA
I once drafted behind a guy and noted a couple of lbs less boost was needed.
Steady state boost is lower with the new flash too. I used to run between 8 and 12psi on flat freeway. Now it sits between 5 and 8psi
Steady state boost is lower with the new flash too. I used to run between 8 and 12psi on flat freeway. Now it sits between 5 and 8psi
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Joined: Aug 2003
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From: Isanti, MN
The PCM calculates fuel usage as GPH, and this calculation is based off of injection timing and RPMs with the stock tune. I'm not sure which software mechanism Spartan uses to change engine behavior, and I probably wouldn't understand it if I did know. But I'm pretty confident that their tuning changes things in a manner that the PCM doesn't know the correct amount of fuel going through the sticks. For example, if you increase fuel rail pressure and keep the injection pulse timing the same fuel usage will go up...will the PCM know that?
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What you calculated makes sense to me. Just curious; what are you towing and what are you calculating for fuel usage?
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From: Frederick, MD
When towing my 5er I am usually in stock settings because it is so heavy. I get around 7-9 depending. Keep in mind that it is 13'6" to the AC unit. A big sail. I am usually around 22K GCWVR.
I can get in the 11's with flatbeds.
I calculate based upon fillup to fillup. I fillup till I see the fuel in the neck. I use my trip a to keep track of it.
I can get in the 11's with flatbeds.
I calculate based upon fillup to fillup. I fillup till I see the fuel in the neck. I use my trip a to keep track of it.
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Senior User
Joined: Mar 2010
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When towing my 5er I am usually in stock settings because it is so heavy. I get around 7-9 depending. Keep in mind that it is 13'6" to the AC unit. A big sail. I am usually around 22K GCWVR.
I can get in the 11's with flatbeds.
I calculate based upon fillup to fillup. I fillup till I see the fuel in the neck. I use my trip a to keep track of it.
I can get in the 11's with flatbeds.
I calculate based upon fillup to fillup. I fillup till I see the fuel in the neck. I use my trip a to keep track of it.
Senior User
Joined: Mar 2010
Posts: 110
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No doubt about it; you have exactly what you need to tow those large trailers and its a wonderful truck inside as well. Good choice and great truck. Congrats.
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