tradosauru

I've been reading a lot of threads about 10% octane regular vs premium gas for the LS.

Since I have a non-ethanol station that is on the way to my daughters school I'm going to have my wife start filling up our 2005 Lexus 430 with 87 Octane non-ethanol and keeping track of the results.

I know the MPG will increase but am wondering if there will be any issues with knocking.

iToaster

The ecu will retard the timing to compensate for an increase in knock. I doubt that you'll see much of a difference, plus the safety correction by the ecu will tend to burn out the catalytic converters faster than normal while saving the motor.

Lavrishevo

iTrader: (1)

The catalytic converter theory does not seem to pan out. How often are you seeing people needing to replace the cats? Like never...

tradosauru

I thought ethanol makes the engine burn hotter and less cleaner?

http://www.bloomberg.com/bw/lifestyl...514_058678.htm

Lavrishevo

iTrader: (1)

Ethanol raises octane but also produces more carbon buildup in an engine. If you can get ethanol free gas it's great but otherwise run a good fuel system cleaner like the Durba Lube mentioned. I also have treated my engine with Marvel Mystery oil and an oversized filter to help combat any carbon buildup over the years. About 3/4 of a quart mixed with Mobile 1 extended performance.

Tom57

270K miles on CPO '01. 250K miles all on 87 octane. Never had any detonation issues, never replaced my cats (or mufflers) - > and the '01 has lived entirely in the rust belt (western NY, Michigan, Illinois, and now Nebraska).

tradosauru

Nice!