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Discussion Starter · #1 ·
I only have about 2,000 miles so far on my 08 6.7L.

I hand cal today when I filled up, and It's getting 18.4, :hyper: btw the over head display said 18.3 when I was leaving the station.

This is mostly hwy, and no towing. Bad part is I do tow in town alot and it's only getting about 9.5. :CRY:

I really do like this truck, the power is great compared to my 04 5.9L. The 68re and the e-break is great too
 

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Congrats on the Truck! They are Great.
 

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if your getting 18 you should be damn happy! I am lucky once in a while to get 15, as far as towing goes it is slowly getting better, we tow a 5th wheel at 14k and it started out around 7.5 -8 mpg and now on average get 10.. mileage has never been consistent, I have gotten from 10 -17.5 just driving, that big a drop from one tank to the next! I love the truck but this emissions crap sucks hindtit!
 

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18 mpg @ 70 mph on hwy
 

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Just did my best at 17.5 mpg measured over 900 miles at around 65mph average, this was traveling from around 600ft elevation to around 9000ft and back.
 
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