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Please help! ISX15 poor fuel mileage - Printable Version

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RE: Please help! ISX15 poor fuel mileage - Waterloo - 11-22-2020

We are getting into the winter fuel too... I have noticed my fuel mileage has dropped its normal .5 mpg, sometimes more depending on my weight.


RE: Please help! ISX15 poor fuel mileage - marek4792 - 11-22-2020

Also wind is a big killer of fuel economy too especially now.


RE: Please help! ISX15 poor fuel mileage - Nihalu - 11-22-2020

(11-22-2020 )marek4792 Wrote:  Also wind is a big killer of fuel economy too especially now.
No doubt about that!!!


RE: Please help! ISX15 poor fuel mileage - hhow55 - 11-22-2020

Smartway tire’s should help


RE: Please help! ISX15 poor fuel mileage - Magard - 11-22-2020

Cold air is really dense also.... So winter fuel cold air and bad rolling resistance tires. 5.8 Mpg is normal. Just keep pushing wind and looking cool man.


RE: Please help! ISX15 poor fuel mileage - Rawze - 11-22-2020

Square nose fuel pig + trying to be competitive in the dry-van/reefer freight market is like shooting yourself in the right foot just before the long marathon ... then wondering why you bled to death along the way.

Maybe a cascadia or prostar with a set of 3.79's in the rears and an ISX mid-tier. Over the stretch of a million miles of trucking, comparing a well cared for Cascadia or Prostar vs. what your trying to push down the roads is easily about $300,000 dollars in fuel saving alone if not more!


You are using the wrong equipment for the jobs. This cannot be fixed.

- In the mean time, you need to at least go thru the truck nose to toes and do some comprehensive testing of all the systems to ensure engine is at its best + the truck components too like CAC, exhaust, etc.

-- and if it is de-mandated... you need to have that program looked at A.S.A.P. to ensure it is not pushing that engine toewards a slow agonizing death.