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Old 10-17-2019, 11:13 AM   #21
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o1marc's Avatar
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Originally Posted by wrenchtech View Post
The best fuel mileage that I was able to observe on my recent trip was 7.7 MPG. On one leg, where I covered 300 miles between fueling stops, I observed 7.4 MPG. This was all open highway driving using cruise control. Oh how sweet it would be to get 10 mpg! If I understand what Iíve been reading, many diesel engines that are under a strict emissions control regime, can have their fuel consumption improved significantly by re-programming the ECM. As the later C7 common rail engines begin to fall out of warranty, I am hoping that some reasonably priced aftermarket tuning services will be offered in the marketplace.
I suspect turning up the power level decreases the MPG.

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Old 10-23-2019, 08:52 PM   #22
Join Date: Mar 2019
Posts: 32
Originally Posted by wrenchtech View Post
Sorry about the repetitive sentences and Iím using dictation on an iPhone and for some reason it is it it has a habit of doubling whatever Iíve dictated. Kind of frustrating
Thought I was losing my mind...
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