6.2L vs 3.0 Diesel, considering upgrading from my '18 6.2L

[Duramax3oh]

After owning my 3.0L for over a year and 30,000 miles (with zero problems!) my thoughts are this:

 

- I LOVE this truck. Perfect for good highway mileage and moderate towing, and/or someone wanting a diesel. For me, this is my first diesel ever and really wanted that for a change. I was just bored of the gas engine for the time being. I have zero regrets for getting it and the engine/transmission fits my needs great. After lifting it and putting larger heavier LT tires on it I feel a sluggishness when starting from a dead stop. Typical and it doesn’t bother me but for someone that is more concerned with “street quickness” after leveling etc I think they’d be dissatisfied. 
 

- If you don’t “really want” a diesel like I did, I’d honestly just recommend people stick with the 5.3 or upgrade to the 6.2; most wanting more out of a truck like 99% of us on a site like this, I think the 6.2 makes more sense. 
 

As I own this 3.0 longer, the more and more I’m convinced it is exceptionally fitted for a unique subgroup specifically wanting this for their needs (like me) but for most people they should just stick with the gas engine. 
 

[Gagliano7]

Convert the 18 to E85 more power and the fuel is alot cheaper. Where i am in ny near nj gas in nj is $3.15 for premium $3.05 for diesel and E85 is $1.89. I average 16 mpg on E85 and 18 mph on premium.

[AONYX]

I've got almost 2000 miles on my 3.0L. I am not currently towing anything and I primarily use this for highway driving, so I don't regen (that I am aware of) terribly often. I love it so far. I haven't really tried hard accelerations but the times that I have, have felt like there was more than enough power to pass or enter traffic. My best MPG (per the computer) was 37.2 for 25 miles...pretty sure that was a 60 mph country road followed by a several mile downhill stretch. Typically getting between 29 and 31 over longer distances. I noticed that adding power service diesel kleen cetane boost seemed to get me about an extra 1-1.5 mpg, based on my very unscientific method, as it seems impossible to find any diesel greater than 40 cetane in my area.

I love it, but I don't tow currently and I don't care about racing anyone in my truck, and most of my miles involve some amount of highway driving.

[redwngr]

12 minutes ago, AONYX said:

I've got almost 2000 miles on my 3.0L. I am not currently towing anything and I primarily use this for highway driving, so I don't regen (that I am aware of) terribly often. I love it so far. I haven't really tried hard accelerations but the times that I have, have felt like there was more than enough power to pass or enter traffic. My best MPG (per the computer) was 37.2 for 25 miles...pretty sure that was a 60 mph country road followed by a several mile downhill stretch. Typically getting between 29 and 31 over longer distances. I noticed that adding power service diesel kleen cetane boost seemed to get me about an extra 1-1.5 mpg, based on my very unscientific method, as it seems impossible to find any diesel greater than 40 cetane in my area.

I love it, but I don't tow currently and I don't care about racing anyone in my truck, and most of my miles involve some amount of highway driving.

Doing mostly 2 lane rural driving, this one is regening about every 250 - 300 miles.

 

I was always able to notice when regens occurred on the LML and L5P trucks I ran for many years - but not on the 3.0L. 

 

Decided to add an aftermarket monitor.

It show regens about every 250 - 300 miles, and that they only last about 10 or 12 minutes/miles.  

 

 

I've never put any additive in any of them.