Makmov

They already did.

But it is very limited and has lots of restrictions.

aribop

So am I understanding this correct....Running clean (no ethanol) 87 octane gas in our cars is better than running 10% ethanol 93 octane?

geolab

Already, 87 no ethanol is cleaner for your engine and fuel system, and for the environment according to G peace.
If I had these only two choices, I would put 87 octane with a can of regular octane booster. (no injection cleaner, miracle power etc), just regular known brand octane booster.
As I understand in the US, the difference in prices between 87 and 93 is around 15 - 20 cents per gallon ? in EU it is 10 cents / liter
so thats 3 dollars per tank full.
I think you could find cases of Oct booster at $5 - $6 dollars a can.
So thats $2 - $3 difference out of the pocket for a tank full.
thats around $90 for 10000 miles.

aribop

Thanks, Geo. Time to buy some octane booster.

Flying Finn

+1 Anyone know what's the best brand here in US?

techman1

Regarding ethanol, does anybody know for new cars what type of gas they use when they release their estimated mpg? If they use "good" gas, which is getting harder to get, doesnt the EPA realize the manufacturers are not giving us a real expectation of MPG?

Matt Lane

Guys, before jumping on the "let's use fuel with severely inadequate octane then try to boost it ourselves with god-knows-what", please do a search on octane and read some of the sage advice from expert engine builders, Steve Weiner etc. You would need a boatload of Octane boost to get from 87 regular grade to the specified 93.

I use non-ethanol lower octane fuel for winter storage, but in the summer heat, with high loads and track use - 94 is a good protection against detonation - in spite of the ethanol.

Best,

Matt

97_993C2

All of this is assuming you can find 87 octane gas with no ethanol. That's probably going to be difficult if you live in, or around, a large metropolitan area. Besides, chances are if the station is selling regular gas with no ethanol, then the premium also doesn't contain ethanol. I think there is something positive to be said for the injection cleaner.

No HTwo O

I have found it very easy to buy ethanol free 93 octane fuel in the State of Wisconsin and some central Illinois cities. The Porsches love it.

race911

Anyone got hard data on using different fuels on which the car "runs better"? I ran plenty of 91 in RSA #1 when I raced it. No difference that I could tell on trap speeds. (Wasn't using data then.) Nor now, with the faux RS, SM, or Radical, I don't see anything significant on the data. I do blend to 95, for the most part.

If we want formulation specs, ERC, our local race fuel producer claims "Hi Octane" oxygenate (MTBE?) in their MUL/A fuel. Their 100 octane blend: http://www.ercracingfuels.com/ercMulA.htm I'm not even going to guess at the number of cars of all types around here that use their products.

Sunoco just flat out admits to 9% ethanol in their 260GT 100 octane, which is sold at the pump at Thunderhill and Sears Point.

Octane boosters? As long as I've been involved with cars, no respectable engine builder has pointed me (or anyone I know) in that direction. Yes, that includes the who's-who of the Porsche world as it exists on the West Coast, as well as guys who build/built FF, FA, Indy, vintage F1.........even lowly front-of-the-pack Spec Miata. (There is $30/gal. "witches brew" Spec Miata fuel that you need to drain after each run session, but that's a whole 'nother story.)

geolab

I reiterate what I said....
If I had the choice between two alternatives, regular gas or 10% ethanol gas
I would choose the regular no ethanol, and will add octane booster why ?
Because 10% ethanol gas is unsuitable in the 993, the fuel system, the intake, the engine.
Since April 2010, it has caused havoc for everybody in europe, and since, the germans are snubbing it totally.
Now the auto producers are marketing their cars with the 'flex fuel' system that is also compatible with the 10% ethanol gas, because people are now aware that 10% ethanol gas is bad for normal gas cars.
My 993 does not have a flex fuel system...

For those who are already using ethanol at 7%, try to unbolt the gas line going to the injectors, and look at the threads of the bolt. This thing doesn't go away, it eats through the metal not to speak of plastics, rubbers.

So I would rather go regular no ethanol.
As for the octane booster, in the cans over here they contain 500 ml or half a litre of MTBE.
so 500 ml in 70 litres of tank, thats 140 times to 1 ratio,
MTBE at 110 octane you need 210 times octane percentage to raise the gas tank octane level to 88 (or from 91 to 92 octane, or in europe from 95 to 96 octane.)
So a can of 500ml octane booster raises the octane level in a full tank by half octane point, so from 95 to 95.5.
To me, it is better than nothing and is still my personal opinion.

cpdjfd107

This thread is like a nightmare and I can't wake up. As far as I know, non-ethanol fuel is rarely if ever found in RI. It is tough to accept that every time I fill up at Shell I am doing harm to the internals of my engine, fuel lines, gas tank, etc. Just plain ol' sucks that it is like this without an option. I think someone else mentioned it but I used to used startron made by starbrite for my boat. It was a fuel additive that was supposed to help negate the harmful effects of ethanol. Most older boats had plastic or fiberglass tanks and the ethanol would slowly dissolve and eat the tank/fuel lines away. I had a stainless tank but I used it with every fill up and it was very popular in the boating world with good results. I wonder if it would help in our engines.

aribop

How about some help in raising the number of signers? Please sign the petition for production of ethanol-free gas.

http://www.thepetitionsite.com/1/keep-pure-gas/

IXLR8

In an e-mail from Shell Canada...

So for you drivers who can't get Shell V-Power.....

cpdjfd107

Is this true for U.S Shell? I strictly use Shell V Power in my 993 and if the same is true for the U.S. as Canada that is great news!