MPG 6.2l

tcracing · February 25, 2019

7 minutes ago, OnTheReel said:

I go by the book. 93. I’m sure there’s some people here that will say 87 is just as good. But personally I didn’t pay extra for the 6.2 just to run it on 87, have it pull timing, and perform like a 5.3.

I plan on going by the book. Just wondering. Thanks for the reply.

eppieguy · February 26, 2019

2 hours ago, tcracing said:

What octane gasoline is everybody using? I'm waiting on my Sierra with the 6.2 to be delivered. Anybody running 87, 89 octane with any ill effects? Hopefully mine will show up in the next couple of weeks. It was made in Mexico which I'm a little upset about, I wish I could have been built in Indiana. I was told by dealer in was going to be Made In USA.

I run 93 only, I didn’t spend extra cash on a 6.2 just to cheap out on the gas.

Jon D · February 26, 2019

I’m getting just over 16 so far for 4000 miles according to the trip computer...sounds a feels about right. 6,2 AT4 with 33” KO2s perf exhaust and cai.

Edited February 26, 2019 by Jon D

TXGREEK · February 26, 2019

What octane gasoline is everybody using? I'm waiting on my Sierra with the 6.2 to be delivered. Anybody running 87, 89 octane with any ill effects? Hopefully mine will show up in the next couple of weeks. It was made in Mexico which I'm a little upset about, I wish I could have been built in Indiana. I was told by dealer in was going to be Made In USA.

Only high octane fuel for the 6.2, it’s a high performance engine that’s tuned completely different from its little siblings, treat it right and you’ll have it running great for a great many years. Treat it like a cheap ass and you’ll regret owning it, it’ll start knocking and can and will eventually damage the engine which will cost you HUGE on repairs. The 6.2’s do not do well with anything less than super. Good luck

Sent from above

tcracing · February 26, 2019

2 minutes ago, TXGREEK said:

Only high octane fuel for the 6.2, it’s a high performance engine that’s tuned completely different from its little siblings, treat it right and you’ll have it running great for a great many years. Treat it like a cheap ass and you’ll regret owning it, it’ll start knocking and can and will eventually damage the engine which will cost you HUGE on repairs. The 6.2’s do not do well with anything less than super. Good luck

Sent from above

Thanks. I plan on using 93 octane, and full synthetic oil. I plan on keeping it for a while. Right now I'm driving a 2000 truck, so I usually take care of what I have.

TXGREEK · February 26, 2019

Thanks. I plan on using 93 octane, and full synthetic oil. I plan on keeping it for a while. Right now I'm driving a 2000 truck, so I usually take care of what I have.

Great to hear that, your 6.2 will definitely put a whole lot more smiles per miles when it’s happy. Btw, not sure you’re aware of this but full synthetic is not 100% synthetic unless it actually says 100% synthetic.

Read the Mobil1 bottle (full synthetic only) versus Amsoil 100% synthetic. I run mostly Mobil1 annual protection every 4K miles. Good luck

Sent from above

tcracing · February 26, 2019

1 minute ago, TXGREEK said:

Great to hear that, your 6.2 will definitely put a whole lot more smiles per miles when it’s happy. Btw, not sure you’re aware of this but full synthetic is not 100% synthetic unless it actually says 100% synthetic.

Read the Mobil1 bottle (full synthetic only) versus Amsoil 100% synthetic. I run mostly Mobil1 annual protection every 4K miles. Good luck

Sent from above

Mobile 1 is all I've ever used. Thanks.

OnTheReel · February 26, 2019

Mobil 1 makes a great Dexos 0w20. Have to make sure whatever you use carries the Dexos Gen2 spec to protect your warranty. Anyway, you sure are in for a treat going from a 19 year old truck.

smit303 · February 26, 2019

A little over 4000 miles. I'm averaging 16.3. Mostly a mix of hilly rural and some city stop and go.

Sierra Dan · February 26, 2019

On ‎2‎/‎25‎/‎2019 at 12:48 PM, gothp28 said:

Goodyear wrangler they look funny

I have to agree with you on that Jay....

Sierra Dan · February 26, 2019

Anyone running the Mobil 1 Advanced Fuel Economy 0w-20?

truckguy82 · February 26, 2019

<K2xx 6.2 with BB tune owner

Just had my truck in for service and had a ‘19 denali for 4 days. Had like 800 miles on it. Obviously on dealer ‘87 octane.

Heard audible knocking at WOT couple times. Clear as day.

Test drove another denali a few months ago and I thought I heard a slight knock but wasn’t sure. Definitely confirmed with this 4 day test drive.

Truck was in sport mode if that matters. Don’t know if they change engine parameters for that.

Never put ‘87 in in ‘19+ 6.2, that’s for damn sure.

On another note. Denali felt kinda slow the first day. I think it adapted to my aggressive driving style. Was pretty quick when I dropped it off. Although the magazines have my 6sp 6.2 a bit quicker stock, and with my BB tune it should be even more of a difference, when I got back in my truck I confirmed the butt dyno, new 6.2 is just as quick and at certain times felt slightly faster than my truck. New 10speed is awesome.

Inwas hoping the new truck got better gas mileage, but that’s a big negative. Same average. 8.5ish (dense NJ driving plus lead foot)

Edited February 26, 2019 by truckguy82

bowtie2007 · February 26, 2019

I also only run 93 octane.

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gothp28 · February 27, 2019

Cheap stuff here from Costco

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KozzyJr · February 28, 2019

My last gas truck had a 6.2. Ran it with 89 most of the time. Never had an issue. Had 189000km on it still ran like a top. But I did have a catch can. No oil in my intake to lower fuel octane levels. Plus I didn’t dog my truck or run wot very often. Mostly highway driving for me. Even with 89 I was still able to achieve 21-22 mpg.