The location where I usually buy all my gas for the LS and the B2 when we are in NWA just put in Ethanol free 91 Octane Premium. It has always been 91 Octane but now it is Ethanol free. Will that make a big difference on the performance of the LS? I only run the Regular 87 Octane in the B2 which still has Ethanol.

Dennis

 

I tried that for a while when my station started selling it. Its 1 cent more per gallon here than regular premium. I didn't notice any change. One thing the non ethanol here is only 87 octane not 91.

 

You'll very likely find pure gasoline improves your MPG by 10-15%.

Seriously.

 

Ethanol has less energy per gallon, so you should see a small improvement in mileage. It is important that it be premium for the LS or the engine computer will retard the spark to prevent knock and you will lose both mileage and power.
Steve

 

More importantly than the fuel economy between the two, non ethanol gasoline is widely speculated as being better for engines. When BMW 7 series engines (4.4 liter), were failing and coking up with carbon, many "experts felt that ethanol was a major contributing factor - if not the only reason. If I could, I'd get non ethanol fuel.

 

I fueled up with it yesterday for the first time. I will keep an eye on the mileage and report back in the future. I will be taking a 408 mile trip to Omaha on the 20th of April so we shall see what it does on a long trip. Going to knock out about 3000 miles between 20 April and 16 May. AR-NE-VA-AR and the nicest thing is I get to drive the LS.

Dennis

 

Ethanol is garbage, it's almost as big a scam as global warming. It cost more to produce to give less mpg. Pure gas is the best, that's why it's all you can buy on the water, if you own a boat that is. I live outside of the crooked criminal city Chicago so I'm stuck with ethanol. Working on my exit now so I'll likely move somewhere I could have low taxes and ethanol free fuel.

Chicago! Come for the food, stay because you got murdered...........

 

Non-ethanol is basically "pure" gas so it's much better for your engine. If the difference between ethanol and non-ethanol versions is only a few cents, definitely fill up non-ethanol. In places like MN where the difference can be up to a dollar depending on the octane, it's not really worth it.

 

The Non-ethanol 91 Octane was only 1 cent more at $2.45 than the Ethanol 91 Octane at Shell $2.47 (3 cent discount) = $2.44..

Dennis

 

personally observed about 10% difference at best. for me, that was 2 mpg. typically got 1-2 mpg better w/ no ethanol.

 

There is no such thing as "pure" gasoline.

"Typical gasoline contains about 150 different chemicals, including benzene, toluene, ethylbenzene and xylene, which also are known as the BTEX compounds." - http://www.idph.state.il.us/envhealt...s/gasoline.htm

There are plenty of chemicals in gasoline that are much worst than ethanol, but having choice is a good thing. On occasion I travel to Wisconsin where I can get non-ethanol premium. Based on very inaccurate one tank samples, I have never noticed a striking difference between both.

 

I wish I could still find "Amoco Ultimate." It was called "pure white gas." And was 93 octane. Now that was some good gas. But Amoco is gone, at least in my area. I believe BP bought them out, and I've not seen Amoco Ultimate for years. It had a glass window on the back of the handle with a little rubber ball that would move around to prove fuel flow. That's all I ran when it was available.

 

Jason

I bet that was back when you were young?

Dennis

 

If you live in a state with chevron, use it. Quality fuel for sure

 

You know what I mean, however.

Ethanol is a contaminate, period, brought to you by the corn lobby.

And, no, you're not likely to notice an MPG difference on one tank.

As an example, my '98 Grand Cherokee 5.9L gets about 13-15 on contaminated gasoline. But burning non-ethanol gasoline...same roads, same weather, same everything but gasoline...it's in the upper-teens. Like 19.whatever. I cannot get it to crack 20 MPG on a tank of about 22 gallons.

The EPA rates that beast of a truck at 11 city/14 highway. Not all vehicles see this large of a swing, but the 1971 tech in my 1998 Jeep certainly does.

I've seen a slight increase on the LS. 8-11%, depending.