With the stock compression ration of our G's, 100 octane is a waste of money. 91-93 octane differs by gas station in STL. Pricing is about the same though, definitely not $.10-$15 difference between those two. Usually about that difference between 93 octane and 87 octane (maybe closer to $.20)

 

Exactly.!! ^^The only time you will feel 100 octane is when you are boosted.!!
Other than that..dont waste your money..

 

ive never seen any 100 octane here in Northern Jersey =-(

 

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

Good article about wasting $$ on higher octanes.

You only need higher octane if you have a knock/pinging problem OR increase your compression. Stick with what the owners manual says. Lower octane (<91) may be okay but potentially damaging if you're hitting the rev limiter much (when cylinder pressures are highest and controlling the burn most important).

 

Yup, no different than running 91 in a car that only needs 87. Manual recommends 91 which of course would include 92 and 93 available in other states. Definitely nothing gained running higher. And if it is not fuel designed
for production automobiles, might even be harmful. ala aviation fuel

 

it wont hurt the stock motor it makes it run better and cleaner. i use a 100 octane every once in awhile with no problems

 

You will enjoy 100 octane better with FI. It allows you to turn up the boost and not explode! (with the right ratio that is)

 

Better and cleaner? Explain.

 

no, you would just need different fuel maps for something more than 100, which would pull out much more hp than stock.

 

its like putting octane boost in your car. it makes your engine perform better by increasing the horsepower and burnig fuel more efficiently.

 

how much is 93 octane? 91 octane?? out there in CA?

 

2.59-2.75 here in cali. for 91

 

Ok, please read the various posts explaing what octane rating is. Show me one report that tells you putting higher octane in a car increases HP. Don't believe everything you read on the labels.

 

Please take a look at this post by this guy on the AV6 forum.

http://www.v6performance.net/forums/...295#post299295

Dyno tests were done on an AV6 and the car lost power using higher octane gas.


Excerpt taken from this site:
http://www.superchargersonline.com/content.asp?ID=105

"What's the benefit of higher octane?

Higher octane fuel has only one beneficial feature - it allows an engine to run at higher temperatures with more advanced ignition timing under higher levels of compression witout detonating / knocking. Higher octane fuel does NOT have more potential energy and will not make an engine perform better unless that engine is knocking. On modern engines with knock sensors, higher octane fuel may make the engine run better if the knock sensors are retarding the ignition timing, which hinders performance. High octane fuel does not burn cleaner, it does not clean your engine, it does not increase horsepower or torque (unless you are experiencing knock), it does not smell better, it does not increase fuel economy (unless you are experiencing knock) and is not better for the environment. If you buy higher octane fuels for any of the above reasons, STOP!"

 

Very true, but running octane lower than what the engine was designed for, can REDUCE horsepower.

It should be obvious you can NOT get more HP than what the engine is designed for by ONLY exceeding the octane level recommended by the manufacturer.

It is also true, all brand name or top tier fuels use detergents.
And sometimes premium does have more of these BUT that does mean you will notice any difference. A lot of it is hype.