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Old 08-05-2018, 03:04 PM   #7
RayChez1
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Join Date: Jun 2005
Posts: 1,257
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Rick: I have the 3126-E Cat engine which is basically the same engine as the C-7. I get average around 8 MPG towing a 2018 Buick Envision ESS. But after reading your posts what I would do first is change the brand of air filter from what you have. It sounds to me like the filter is not feeding that turbo all the air it needs. I changed from a Farr & Wix air filters that I used to use to a Racor which you can get through the internet. As soon as I changed the air filter my coach had so much more power that it was unbelievable what a difference it made and it gets around 9 mpg pretty consistent.

I have also read that maybe the fuel system on your Cat engine needs to be re-flashed on the ECU.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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