Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

chevy 6.5 fuel mileage

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Old Sep 11, 2019 | 11:05 PM
  #41  
Katy Carnell's Avatar
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Originally Posted by 2MuchJunk
I have to agree with crazy. I have had 4 of them and the best I have ever got was 19.5 and that was with the second biggest one I have had. The smallest 6.5 truck I had was a light 3/4ton 2wd and it got the worst at 14. Most of them seam to average around 18.

My best one i had was a 96 1/2 6.5 turbo diesel sidestep was getting 21mpg when empty highway driving.
 
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Old Oct 17, 2019 | 10:16 AM
  #42  
BIGBASSHUNTER's Avatar
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Originally Posted by jasonduke5
Wow i only get 10 not towing and in the winter. But i think i have boost issues.
No u have injector or pump issues
 
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Old Oct 17, 2019 | 10:18 AM
  #43  
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Originally Posted by BIGBASSHUNTER
No u have injector or pump issues
Change chip to #5 and take filter of the injection pump harness. That sh increase ur mpg if u don't have issues. And if ur not running a turbo master ur always gonna have boost issues. I made my own tm
 
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Old Oct 21, 2019 | 11:19 AM
  #44  
jrsavoie's Avatar
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From: East north central Illinois
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Originally Posted by BIGBASSHUNTER
Change chip to #5 and take filter of the injection pump harness. That sh increase ur mpg if u don't have issues. And if ur not running a turbo master ur always gonna have boost issues. I made my own tm

I've never had many issues with the stock setup.

Depends on what you are doing. If you ever need a new turbo, I'd go HX or quadstar. Quadstar is a very reliable vendor for 6.5 diesel stuff

Do not do a turbo master without a gauge.

X2 on removing the optic filter harness if you have one
 
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