billscamaros

iTrader: (1)

I've typically used 93 octane in my '99 Z28 M6 for quite awhile.

Do you use a lower octane rating (89 or 87)? If so, any issues such as knock? Anyone document a MPG difference?

Thanks

RARON455

iTrader: (35)

I have raised compression on my stroker, so to avoid detonation It Is A Must for me to run 92-93 octane.

Wimimc

iTrader: (2)

93 Sunoco

BirdsSince16

iTrader: (3)

93 Octane V-Power from Shell. Never had an issue.

TheSilverOne

iTrader: (22)

93 octane

Unertl42

iTrader: (63)

93 Octane

killagt

iTrader: (3)

highest number at gas station

Arctic2002ss

I have had to run 89 in mine for about a week. It ran fine but I could feel the power loss.

Empatho

iTrader: (16)

I have been using 87 for about six years on my camaro without any problems, sometimes I use 89 though. And I don't know about the power loss, because I still smash mustangs left and right.

Davey G

iTrader: (1)

For the .20 a gallon difference it is to run the higher octane in our cars that is worth the extra $3-4 per fill up if you ask me. For a stock car you may never have a problem but it's not worth taking any chances over a few bucks in my opinion.

shaun

well you can run lower octane and be fine on a stock car because it will compinsate for it but on a moded car thats tuned the car will run like crap and you will get a lot of knock retard and lose some power.

Keithm89

iTrader: (2)

91. Go SoCal.

BirdsSince16

iTrader: (3)

I hate to , but instead of posting another topic about it, anyone know the true difference between cheap and expensive fuel of the same octane? Such as Spectrum or something similar compared to Chevron or Shell?

Gallstaff

iTrader: (1)

I'm no expert, and this is strictly anecdotal, but I've always heard that most of that gas is identical in that it has to meet federal requirements to be sold in the first place - so station to station, you're pretty much getting the same thing.

However, I ALWAYS go out of my way to find a gas station that doesn't use ethanol in their gasoline. I'm of the opinion that there's no way that crap is of any benefit to your car and is just a ploy by the gub'ment to justify huge corn subsidies with no place else to put the stuff.

Thats just my two cents.

wssix99

iTrader: (5)

There is a difference in the additives and detergents in the gas. Most of the gas is octane, (http://en.wikipedia.org/wiki/Octane) which is a pure chemical and is the same thing in any gas pump. (Gas companies can even sell the base chemical between themselves. So, you could get octane from a BP gas station that came from and Exxon well.) Before its sold at the station, the companies put in the additives and detergents.

I had a conversation a couple of years ago at a conference with some chemical engineers from a large international petroleum company and they swore up and down that the thing to do is to go for Top Tier gasoline. (http://www.toptiergas.com/retailers.html BTW - this list changes all the time.) The Top Tier retailers exceed the government specifications for additives and meet the higher specs defined by the allied car OEMs.

The engineers even put other company's gas in their car because their own company doesn't sell to the Top Tier spec. At the time, they also said that two companies even exceeded the Top Tier spec., but I can't remember who they were and I'll bet its changed by now. Unless you are a chemical engineer/analyst, the Top Tier list is the best thing I know to go by.


On the octane rating of the gas, 93 is the safe bet in all conditions. A lot of other things go in to the knock equation, like altitude and ambient temperature. Someone in LA during the summer may have a totally different experience on 87 octane than someone in Denver during the winter.

senicalj4579

iTrader: (41)

93 octane. It went up .12 a gallon just over night. I paid 3.96 a gallon this morning here in the communist state of CT

LooseMoose

iTrader: (3)

I don't care how high gas gets it's worth putting premium in these babies!!!! **** a hybrid

TORCHD 02 TA

iTrader: (39)

Been using 93 since I bought my Trans Am.. And ever since I added a cam, increasd timing 93 is MUST

Joe00SS

when mine was stock i switched between 93 and 87 and the difference was 87 you save a couple bucks you get little bit less performance and less mpg.
highway driving i got about 26mpg on 93 and 23-24mpg on 87.
Also the amount of gas you get, say you put $20 in your tank there is like a .2-.3 gal difference per $20. So its really not even worth using 87. Hell once i did this little experiment i put 93 in my 1994 honda accord

safemode

iTrader: (1)

high octane wont help cars that are made for 87. Our cars are made for 93 stock, but the computer will retard the timing hardcore to compensate if you decide to be a cheap bastard and put 87 in. Cars made for 87 octane wont, however, do much to make use of 93.