07-08 6.2 (380hp) vs 09 6.2 (403hp) - What's different?

What's the difference between the two? Is it just tuning? I thought they were all 403hp.

 

That is a good question. I also remember that when the 6.2 L92 first came out (in the Escalade in '07) it was rated at 403hp and the Yukon Denali only 381 or so. It seems that AFM isn't the difference between the two ratings either because some of the AFM equipped engines also get the 403hp rating.

 

I just had a 2011 Sierra Denali for a day - it did not have AFM. Do some 6.2's have it and some didn't!? I couldn't get more than 12.9 out of that truck with it on cruise at 70 on the highway.

 

I may be wrong on this as I'm not sure if SUVs have had it both ways but I believe this to be the case:

Trucks, no AFM
SUVs, AFM

This is at least the case for the last two model years, not sure about earlier than that.


ETA:

Check the GM powertrain website they separate the engines by year and RPO code. Pretty good info there.

 

I know most everyone gets it tuned out cause they have exhaust and the 4 cylinders sound funny but if it changes my mpg by 6-7mpg - I think I would keep it on!

 

2011 should be RPO code L9H (like my truck) and will not come with AFM (which I like). Was it an AWD model? I bet those aren't too good on fuel economy. When my truck was stock I got 1 tank where I averaged 16.4 but had to keep it around 65 on the highway.

 

Not sure about the 6.2, but when I had the 5.3 with 4 cylinder mode, I tuned it out and tuned for horsepower and only lost 1mpg. It never really stayed in 4 cyl mode long and thats on alot of hwy driving.

 

Yes it was an AWD truck - i'm trying to figure out if I actually need AWD or not though.

When I first bought my RCSB 5.3 with AFM, it was getting 20-21mpg, i put longtubes and tune on it and only saw 15-16 after that.

 

i got a 6.2 ccsb 4x4 all terrain with 342s and i am seeing on average 16.5. best tank to date is 21 and worst is 11. it's all about how hard you are on that right pedal!!!!!!!!!! mine does not have AFM and is flex fuel and rated at 403/417. if you even think about starting to have fun with this beast it gets thirsty!!!!!! if i had it to do over again i would still get the 6.2. i might spend an extra 80-90 bucks a month but i think that is worth it. i can only imagine how bad the AWD trucks use the fuel.

 

I assure you the 2WD Denali is fun to play around in, before the Traction Control decides your having too much fun anyhow...