Lvt19672

What gas is everyone running? Here in Cali, we have the lowest octane for super unleaded 91 octane, I'm sure it's affecting my 997's performance, just wondering what everyone's preference is.

david

Also in CA and I only use Chevron or Shell 91 octane.

LexVan

Buy the highest octane you can (91 or 93) from the busiest national brand gas stations.

Hella-Buggin'

In California we only get up to 91 octane. Personally I use 76 ConocoPhillips, but I'm pretty sure all the major brands get their base stock from the same place. It's the additives they put in that differentiate them. That's just marketing as far as I can tell.

Mudcat

Consistent use of the same brand is best. Personally use Chevron.

RED HORSE

First, use freshest gas you can. Then use ethanol gas if possible http://www.buyrealgas.com/, then use a top tier gas http://www.toptiergas.com/retailers.html. IMHO. Of course you want premium so you can get the octane recommended by Porsche.

911Steve

SoCal here I always use 91 Union (76) never a problem.

alpine-al

I'm sure that you meant to type "use ethanol free gas if possible".

.

RED HORSE

Exactly, or as I like to refer to it, uncontaminated gasoline.

Spyerx

We can't get non-ethanol gas here in SoCal unless (maybe?) you're buying race gas.

I use Chevron 91 in all my cars, have for years.

dbv1

CA gas situation (nothing over 91) sucks. Over here in ON/QC we get 94 octane, $0.03/litre more expensive than 91 octane. Both 91 and 94 are ethanol-free here. My turbo Audi definitely likes 94 better in the summer heat (no pinging, more power). I put 94 in both the Audi and the 911, year-round.

GSIRM3

Then don't buy Top Tier gas. If you go to their website and look at the formulation for Top Tier gas, you will see that it specifies ethanol. Actually, it is very hard to find ethanol free gas in the US.

1.3.1.2 Base Fuel. The base fuel shall conform to ASTM D 4814 and shall contain commercial fuel grade ethanol conforming to ASTM D 4806. All gasoline blend stocks used to formulate the base fuel shall be representative of normal U.S. refinery operations and shall be derived from conversion units downstream of distillation. Butanes and pentanes are allowed for vapor pressure adjustment. The use of chemical streams is prohibited. The base fuel shall have the following specific properties after the addition of ethanol:

Contain enough denatured ethanol such that the actual ethanol content is no less than 8.0 and no more than 10.0 volume percent.
Contain no less than 8 volume percent olefins. At least 75% of the olefins shall be derived from FCC gasoline as defined by CARB (advisory letter, April 19, 2001).
Contain no less than 28 volume percent aromatics as measured by ASTM D 1319 or D 5580.
Contain no less than 24 mg/kg sulfur as measured by ASTM D 2622 or D 5453. At least 60% of the sulfur shall be derived from FCC blend stock.
Produce a 90% evaporation distillation temperature no less than 290F. as measured by ASTM D 86.
Produce IVD no less than 500 mg averaged over all intake valves.

Lvt19672

There's always been the argument that gas is gas and what we all are really paying for is the marketing and advertisement for "big oil", anyone agree?

SToronto

Where do u get 94 ethanol free in ON? Petro-Can, but that has ethanol.

Hella-Buggin'

It all comes from the same tank but "top tier" means that certain manufactures get the stuff at the top while others grab the dregs from the bottom.