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I picked up a Black Diamond Denali on the 4th and drove it 220 miles home. On the trip there my 17 Denali got 19mph on the way there driving about 80mph. On the way home i got 13. There wasn't any wind either.

I know it needs to break in a little but it's not going to come up 50%. I'm at nearly 700 miles now and the dash reads 14.1 avg.

Anyone else have an experience with the 10 speeds yet, and how they do on mileage? Any suggestions, dealer has already said come back after a few thousand miles.
 

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I got my 21 two weeks ago. Did a 350 mile trip with a lot of up and down hills. average was 16.8 running 78sh.
 

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I picked up a Black Diamond Denali on the 4th and drove it 220 miles home. On the trip there my 17 Denali got 19mph on the way there driving about 80mph. On the way home i got 13. There wasn't any wind either.

I know it needs to break in a little but it's not going to come up 50%. I'm at nearly 700 miles now and the dash reads 14.1 avg.

Anyone else have an experience with the 10 speeds yet, and how they do on mileage? Any suggestions, dealer has already said come back after a few thousand miles.
Regens will affect mileage
 

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Regens will affect mileage
i wish i could tell if it is or not. The dealership can't find **** unless there's a fault code to tell them what to do.
 

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i wish i could tell if it is or not. The dealership can't find **** unless there's a fault code to tell them what to do.
The dealership needs a code to appear so they can be paid by GM for any diagnostics/repairs. Otherwise, they don't care.
Having a Banks system w/ iDash or another type of Monitor can show you when your truck is in Regen.
 

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The dealership needs a code to appear so they can be paid by GM for any diagnostics/repairs. Otherwise, they don't care.
Having a Banks system w/ iDash or another type of Monitor can show you when your truck is in Regen.
They don't actually, lots of things break with out fault codes. They just don't know what to do without one.

I've looked at an insight but didn't want to spend $400 bucks to prove what it's doing. Does anyone know if any of the cheaper diagnostic scanners alert to a regen? If Banks and Edge can read it off the CANbus i would think the scanners might be able to.
 

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They don't actually, lots of things break with out fault codes. They just don't know what to do without one.

I've looked at an insight but didn't want to spend $400 bucks to prove what it's doing. Does anyone know if any of the cheaper diagnostic scanners alert to a regen? If Banks and Edge can read it off the CANbus i would think the scanners might be able to.
The Autel Maxicheck Pro is one. If you google you can find other sources
 

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My scantool.net OBDLink MX Bluetooth OBD2 adapter has a free phone app that can be downloaded for it. That app had free “extra PID” add-one, and the Duramax add-on has regen info in it. The adapter was $100 or less (they have several models).
 
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