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I purchased a 2018 GMC Canyon Denali Duramax 4x4 in mid-November 2017. I turned over 37,000 miles this morning. So far no issues with the truck. I'm getting around 27.5 mpg overall; that's manual calculation, not the truck computer. My commute is 60 miles one way, and most of it is highway. I occasionally tow a boat and utility trailer. Home is SW Washington State. Only mod so far is putting a Diamondback SE bed cap on it.

There are a couple things that were surprises after I got the truck. For example, I was expecting to have the info display post the speed limit for the road I'm on like my last GM truck. This one doesn't, unless I have it on that particular screen. Another surprise was not having a power seat back setting; it's manual.

My biggest pet peeve with the truck so far is tires. I need 10 ply tires for traveling off paved roads, and so far striking out on the P255 55 R20 size. Really, is it too much to ask to use a standard tire size! Really ticking me off; looks like I'll have to change tire size to get a good tire. Rant over...sorry, but frustrating.

I'm interested in checking out either a plug in device, or tune to get my fuel economy up. Also wanted to know what others thought of catch cans.
 

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You might see if you couldn't acquire some smaller rims off of another truck. Or just get aftermarket rims that are smaller to see if you could find 10 ply tires in a 17 or 18 inch tire.

Tuning will help with a lot of things. Do not go with something plug in like the Pedal Commander, it is a hoax...get a real tune from one of the great companies out there.

I have a catch can that has yet to be installed. I do believe that they work and are needed on our trucks to get the oil that is making its way in to the intercooler.
 
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