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Discussion Starter · #1 ·
I have an 08 Duramax LMM and im only getting 10-12 on the interstate. I used to run the Banks Six Gun with stock exhaust and get 16-18. I started losing power and getting terrible mileage 6-8 so i put in the H and S mini maxx with turbo back 5" assuming the DPF was getting plugged, which helped a little but i figure i should be getting over 15mpg
 

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Oh...... Squirrel!
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Is this hand calculated or dashboard?

I'd run a jug of Power Service though it.

Mine sees a silver jug every other tank and I'm sitting at 15ish city on 37's.
 

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how long since the last fuel filter change?
 

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Go ahead and delete the dpf, is prob super clogged with the banks or mini maxx
 

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Go ahead and delete the dpf, is prob super clogged with the banks or mini maxx

^^^^^This !!

I agree that you probably have a clogged DPF.
 

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it stinks and whistles :)
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Did you guys even read ops post? :rofl:

I have an 08 Duramax LMM and im only getting 10-12 on the interstate. I used to run the Banks Six Gun with stock exhaust and get 16-18. I started losing power and getting terrible mileage 6-8 so i put in the H and S mini maxx with turbo back 5" assuming the DPF was getting plugged, which helped a little but i figure i should be getting over 15mpg
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