New Chevy 6.0L gasser -- Octane?

monkey44 wrote:
Yeah -- I wouldn't run the 85 ethanol either ... we have 87-89-91 here, and the dealer actually got back to me today and says the engine is set up for 87 from the factory. So, I'll try it for a few tanks each and see what happens.

I was just wondering what other trucks run and why it might be better one or the other. Don't care as much about the savings per gallon as I do the best performance of the truck - I plan on owning this one for a long time and want to treat it right from day one ... our truck will take care of us if we take care of it ... That's my thought anyway.

Depends on what you want?

You say "Don't care as much about the savings per gallon as I do the best performance of the truck."
What kind of performance? Most HP? If so, fill her up with E85 and hammer down. That is where you will find the most HP.

Most MPG? It's going to be VERY close between regular and premium if both have Eth in them like we have out in Ca. You will get right at 4 to 5% better fuel economy with no Eth. Like I said above, it can even boil down to weather or even altitude for octane. So if fuel economy is important then get one with no Eth.

Bottom line is:

You want power? Get a fuel with the highest alkie content possible.

You want mileage? Get a fuel with the lowest alkie content possible.

Wear? Really no difference between the two. The OLM will more than likely go off sooner if you use E85.