larryz71

Mine sits around 26 at idle and cruising on the highway. Just like yours, it only increases to somewhere between 30-50 under somewhat aggressive acceleration. I don’t recall ever seeing mine above 60, but don’t recall ever giving her full throttle. Sent from my iPhone using Tapatalk

Following. I don't have top tier diesel available near me. I bought some opti-lube summer+ but am nervous to put it in the tank without being more educated. Impulse buy....

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Thanks for the info firetrout & akawally. Keep us posted.

Getting ready for my first oil change... does anyone know where I can order the oil online? I am having a hard time finding it. Also, any recommendations on the brand of oil filter I should go with? Should I just stick with the ACDelco PF66?

Didn't expect the 3.0L to beat the 5.3L in a drag race.

Really depends on the spread between 87 and diesel which fluctuates constantly. The other unknown variable is maintenance costs between the two. It’s safe to say the diesel will be higher, but by how much? I could easily argue the cost savings vs. the 6.2, but to argue against the 5.3 would be subjective at best. The rationale for MY decision to go for the duramax was: 1) total cost of ownership vs 5.3 - who has a crystal ball? probably a wash.. 2) I’d consider myself an enthusiast so a premium engine option makes me happy.. 3) personally, I don’t care about how fast my truck goes, as long as it is fast enough to feel safe (which the 3.0 provides easily) 4)The 3.0 puts out the same torque as the 6.2, and at a much lower RPM 5)I have a two year old and travel across state lines regularly to see family. Regardless of engine option, you get a 24 gallon tank (to my knowledge). The duramax makes late night drives so much easier. My 5.3 AT4 was lucky to get 17 MPG at 80-85MPH. Stopping constantly for fuels wakes up the little one and the wife. That s*** will ruin a long trip quickly. Sent from my iPhone using Tapatalk

absolutely

I have a short box. I wish I could have gotten the standard, but unfortunately it wouldn't fit in my garage.

I only have ~800 miles on my Duramax AT4, but so far I am very impressed. The powertrain feels light years ahead of the 2019 8 speed 5.3L AT4 that I traded in. No disrespect to 5.3L 8 speed owners, as I have owned 3 of that powertrain combo myself, but there really is no comparison for MY tastes. My last 8 speed (2019 AT4) was the best of the 3 I have owned... I really believe GM fixed a lot of issues with the changes they made to the 8 speed for the T1 platform, but it just was never truly smooth. The 10 speed Duramax combination on the other hand is smooth a silk. Only complaint: The Duramax seems to take much longer than the gas v8's to warm up. Gas mileage won't be great with the Duramax (in my limited experience) until it is fully up to operating temp. If a high percentage of my driving was short trips of say less than ~5 miles one way, I would probably prefer the gas. The sound of the engine is great, nice and quiet, but you definitely know its a Diesel. Fuel mileage has been wonderful compared to my 2019 5.3L AT4. I listed some of my fuel economy numbers below, if interested. 2020 Duramax AT4 (800 miles) Best 25 - 33.3 mpg Best 50 - 30.1 mpg Best 400 - 25.1 mpg LTD - 24.3 (a lot of idling early on without many miles to normalize - slowly creeping up) 2019 5.3L AT4 (5200 miles) Best 25 - 24.5 mpg Best 50 - 21.2 mpg Best 400 - (didn't get a picture of this before I traded, but I believe it was in the low 19's) LTD - 17.5 mpg Both are literally the same exact truck down to the color, other than the powertrain of course. Same stock 18" wheels and factory duratracs.

Beautiful truck! Glad to hear you are liking the duramax. I just got one myself! Sent from my iPhone using Tapatalk

Any update? My 3.0L AT4 will be delivered early next week! I liked everything about my 2019 5.3L AT4 except the gas mileage. My lifetime average over 5200 miles is 17.4, and that was with fairly ideal conditions and my definition of conservative driving.

Thanks for the info. I’m considering trading my 2019 5.3 AT4 in on a 2020 3.0. Looking forward to further updates! Sent from my iPhone using Tapatalk

Congrats OP - let haters hate. Your rationale behind picking the 2.7T sound logical to me... Not all of us regularly have to displace fallen trees from seemingly major thoroughfares. Keep us posted on your impressions when you get more miles on her! Sent from my iPhone using Tapatalk

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