Christien

If you really want extra octane, buy a bottle of it at Canadian tire. This topic has been well covered here, and the consensus is always shell 91.

Ronan

Another Shell V power user.

Zookie

same

IXLR8

And confirmed in an e-mail to me from Shell...

Not that many of us would need it, but its unfortunate that our Shell V-Power isn't the same as the Shell V-Power (100, about 95 in our numbers) available in Europe.

Speedyellow993

My understanding was that 1999 and older should not use Ethanol.

All 1999 and newer Porsche should run as high as possible octane pump gas regardless of Ethanol or not.

Turbos are especially sensitive to lower octane.

Adamant1971

Vpower, but it sure is a pain to find sometimes

Torontoworker

What? I don't know why I'm so, oh, I don't know, distracted? Now what were you saying again?

theiceman

hey I think i know her

996_North

looks like Shell V power is winning ! thanks for all the input.

dc88

I thought I was doing the best for my car using ultra 94 and not the Shell 91.

Does the octane level make a difference or better to watch out for ethanol.

Tomas993

Um, not exactly.

Husky sites (most of them formerly Sunoco and P-Can locations recently purchased and rebranded) in the GTA and S.Ontario all offer a 91 octane product with absolutely no ethanol.
This is true of B.C. too (though not the Island) and select sites in Alberta (those without blender pumps).

Zookie

well your Ignition System just has to work harder to burn 94 which is not needed compare to 91...

Its like being on top is harder work, than just making like a seal and laying at the bottom

jasonintoronto

The exception are cars that have been tuned that can take advantage of the higher octane. If you've done that, higher octane, even with ethanol, may be warranted.

Cosmo Kramer

Umm, the ignition system doesn't "work hard". Higher octane burns more slowly and in a more controlled fashion. The manufacturer sets the ignition timing for the engine based on the fuel they designed it for. On newer cars, they all have knock sensors, so if the octane is too low and there is a knock event, the computer retards the timing enough to make the knock go away. This lowers your horsepower output.

On a non-modified Porsche engine, use the recommended octane, no more no less. Lower then recommended octane will cause the computer to retard the timing and decrease performance. Higher then recommended octane burns slower so it also reduces performance, plus it costs more per L.

Ethanol content? It reduces overall MPG/HP a bit as ethanol has less stored energy then the equivalent amount of gasoline and it absorbs water. Most fuel systems (like anything made in the last 35 years) can handle it and the fuel system is completely sealed from the outside air so moisture absorption is a minimum. One of the 928 guys took all the fuel components and soaked them in E85 for months and nothing happened to them, so 5-10% ethanol isn't going to ruin your car even if it is older. Ontario has a law that all gasoline manufacturers have to average 5% ethanol content. Shell gets around this by putting 10% in their regular at 5% in their midgrade and 0% in their premium, so overall they meet the 5%.

Jaak Lepson

http://www.ehow.com/info_12162213_et...ar-engine.html

http://www.businessweek.com/lifestyl...514_058678.htm

http://www.jsonline.com/business/new...132968333.html

http://www.fuel-testers.com/list_e10_engine_damage.html

Hey, it's your car and your $$$$.

Shell 91 is all I use in the P-car. Do a search in Canada on Rennlist. This has been hashed out over the years. A few folks here kept burning out their cats till they moved over to shell 91.