Advertised 110 octane

Unless your engine has a need for it (higher compression,advanced timing,etc...)you will see no other benefit except maybe the smell.
low compression engines(without superchargers,turbos or nitrous)will actually lose power from too much octane.The idea is to use fuel with enough octane to control detonation and no higher(in a streeet car that is).If you are going to the track and want to advance the timing and add some race fuel,you will usually gain a couple of horsepower but not usually enough to warrant the effort.Not in a Pantera anyway(setting the timing is a Bitch!).

Running the stuff straight allows running up to maybe 13-1/2:1 compression ratios. Mixing it at some amount will raise the octane of the cheaper pump gas, but since this is a non-linear effect, I can't tell you what you'll wind up with. If you don't run racing compression ratios in your engine, I'm afraid its sort of wasted money- a 9-1/2: 1 engine won't need it and can't use it to much advantage without a piston or head change.

The highest octane I can find in my area of southern California is 91. I would like to use an additive of some sort (VP fuels, etc.) that would boost my octane to about 94. I have a 2001 Boxster S and according to the manual you should use 93, at least.Any suggestion on the additive of choice. I am not going to rework my Cleveland to accomodate this junk gasoline we are forced to accept. I would rather sell the car.

REGARDING OTHER FUELS ! in New Zealand (with a little hunting 0 you can get your hands on aviation fuel ie for small planes this is around 100 octane and is leaded. if u go to your local areo club and make friends you may be surprised at the cost of the gas .
over here its about $1.00 nz a litre or about $2 to $3.00 per gallon.
good luck and keep us posted

Jack, how about compression of 10.5 to 1? I want to ensure I am not getting detonation, but have been using 91 octane.

As far as running 10 or 10-1/2:1 compression ratio in your engine, there are ways to cheat a little. Note the engine doesn't know what ratio it has; it only knows combustion pressures and fuel-burn speed. So, by running a really big camshaft, the combustion pressures at street velocities are actually lowered, allowing more compression. Another way is by using aluminum heads, since they lower the head temperatures significantly, so detonation doesn't occur as easily. Finally, a good multiport fuel injection system so well controls fuel entry, more compression can be used. The traditional way of course is to back off timing advance a bit. All but the last are expensive, though. As for the Porsche engine, your injection system is probably calibrated ghostly-lean for emissions; I suggest you locate someone that has a rep' for tuning race-computers for Porsches, and convince him you're going to open-track the car. The knock-sensor will most likely protect you from engine damage. 1/2 pint of isopropyl alcohol (hardware-store Rubbing Alcohol) or a can of "Dry-Gas" from Kragens in each tank of fuel may help your knock-problem, too.

I read on this site before that too much octane can also ruin an engine. I thought excess octane is just wasted?????????

Again, "too much octane" won't, in my experience, do anything except lighten your billfold. The only exception might be really high-octane stuff, such as 115/145 avgas run 100%- this stuff is designed for enormous bore sizes and low rms, so it's very slow burning. In a street engine, possibly still burning as it exits your mufflers. Such could theoretically burn valves and wreck exhaust systems, although I've not seen an engine this has happened to. Illegal in any case as the Feds haven't got their road tax for it. And 118-octane racing fuel is well over $8 a gallon, so this probably isn't a common problem for street engines.

I THINK I SAW IN THE BACK OF AN MAGIZINE AN ADVERTIZEMENT FOR TETA ETHLE LEAD. IT CAME BY THE PINT ,GALLON, AND 5 GALLONS. BUT DONT REMEMBER THE SUPPLIER. COULD HAVE BEEN IN A HOT ROD MAG.

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Originally posted by old and slow:
Union 76 has a local station advertising the above described LEADED gas. Its very expensive-$37.50 for a 5 gallon can. When I redid my engine we put hard seats and stainless valves. What effects would a mixture -say 5 gallons leaded race and 10 gallons unleaded 91 octane- have on my engine. The attendant said they would carry this racing fuel on a continuing basis.

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'real tetraethyllead', eh? TEL is one of the most poisonous substances known to man, plus being much more unstable than nitroglycerine. The Ethyl Corporation used to make the stuff for gasoline companies when no one else wanted to, and with 50 years of experience they still occasionally vaporized entire mfg plants at random intervals. Most manufacturing was done entirely by robot after hundreds of workers & researchers were killed over the years making the stuff. Shipping such substances around the countryside is virtually prohibited unless its in such minute amounts that no harm could possibly come to the population. So you have to wonder just how much good such a highly poisonous, violently explosive material would do at such dilution that its allowed on store shelves.

THANKS JACK, I MUST HAVE BEEN COMFUSED. I WOULD LIKE TO FIND AND OCTANE BOOSTER THAT WOULD ALLOW BE TO LIMP HOME A 14TO1 YATES HEADED MOTOR IF CAUGHT TOO FAR FROM HOME. RC

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Originally posted by jack deryke:
'real tetraethyllead', eh? TEL is one of the most poisonous substances known to man, plus being much more unstable than nitroglycerine. The Ethyl Corporation used to make the stuff for gasoline companies when no one else wanted to, and with 50 years of experience they still occasionally vaporized entire mfg plants at random intervals. Most manufacturing was done entirely by robot after hundreds of workers & researchers were killed over the years making the stuff. Shipping such substances around the countryside is virtually prohibited unless its in such minute amounts that no harm could possibly come to the population. So you have to wonder just how much good such a highly poisonous, violently explosive material would do at such dilution that its allowed on store shelves.

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RC
I am looking for the same answer. That was my question, but somehow it was misinterpreted. I want a little insurance when I drive my approx 10.9 compression ratio car. I have found the product called "104 Octance Booster" claims it's use will jack your octane rating up a full 7 points. If true, that will give me around 98-99 octane gas. Its about 8 dollars a bottle and that treats a full tank. I'm not concerned with cost, just a little peace of mind. I have used it about 15 months.
Lar

PS
I sincerely appreciate the job you are doing!

one additional thing i have found with fuel additives is they acceleate the process of deterioating rubber hoses, on top of the dammage that our current gas does.