6.2 to 5.3

[iamdub]

Not talking about ‘cleaning the engine with premium’

Neither am I- is anyone?

...a higher compression engine, like the ls, benefits from higher octane.

Si.

My reply wasn't a personal attack on you or anyone. I just took the opportunity, since it was mentioned, to spill some info cuz I know this is such a widespread misconception.

Because higher octane gas burns slower, it is more resistant to knock when subjected to higher RPM and cylinder pressures. Compression ratios also factor into cylinder pressures. Higher ratios cause highercylinder pressures and therefore cause the engine to be more susceptible to pre-detonation or knock.

This excerpt from Hemmings Motor News pretty much echoes what I said. Slightly more technical, but same principles expressed.

 

[iamdub]

E85 gives about fifteen free horsepower and a little more than that of torque. There are a couple of stations in Baton Rouge, don't know how close you are to them last time I looked. If the price drops below $2 a gallon, my truck will be almost as inexpensive to run as my daughter's Kia.

Well, I'll be a son-of-a-****. I didn't know it was THAT much a power difference. Since I regained possession of the Tahoe back in March, I've avoided ethanol fuels because it stays parked for so long. I like more horseytorques, though, especially when they're free. It's been a while, but I'll look up those E85 stations and make it a point to fill up there next time I'm out for a road trip.

 

[Derick]

Had a 5.3 in my 2007 Suburban, snip Plus it can pull a trailer at highway speed.

Are you being facetious or is that a thing? I've got the iron block 6.0 in my burb and well, its not quick but I don't have any issue pulling my camper at highway speeds. That said, now having driven my truck for a bit now, I couldn't possibly see anything less than a 6.0 in there. I thought the standard 1/2 ton burbs had the aluminum 6.0....was that the next option up and 5.3 was base model?

 

[gooffeyguy]

My wife says I'm crazy, but I've noticed the exhaust smells different, kind of sweeter, when using E85

2001 Yukon SLT
2012 Yukon XL Denali
2011 Yukon Denali RIP 5/20/18

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[swathdiver]

Well, I'll be a son-of-a-****. I didn't know it was THAT much a power difference. Since I regained possession of the Tahoe back in March, I've avoided ethanol fuels because it stays parked for so long. I like more horseytorques, though, especially when they're free. It's been a while, but I'll look up those E85 stations and make it a point to fill up there next time I'm out for a road trip.

Depending on how much gasoline is leftover, the first tank's alcohol content will be somewhere in the 50-60% range usually. Not sure what the winter blend is but I've been at 72% for the last few fills. Fun stuff.

I thought the standard 1/2 ton burbs had the aluminum 6.0....was that the next option up and 5.3 was base model?

For the 2007+ the L76 6.0 was optional through 2009. Then it was dropped and only the FlexFuel engines remained. This is for the 1500s. The short SUVs could also get the 4.8s in the base models and these were not FlexFuel.

My wife says I'm crazy, but I've noticed the exhaust smells different, kind of sweeter, when using E85

Not crazy at all, it smells like food, it's corn after all.