BlaineyB

on your SC's what kind of gas do you use? 87,89,91,93?
does it really matter on our cars?

Kira X

iTrader: (24)

I use 91. I would use 93, but very few gas stations have it around me.

I've heard that it does make a difference on how our cars run and I've also heard that it doesn't matter. Most of my friends use 87 gas and have no trouble with their cars.

abounly

iTrader: (27)

i use 91, highest around me.

SC YAA

I use 93 in my car.

Li Ls4

iTrader: (12)

93 for me.

Sleeksc3

93 for me

10char

Luxor

iTrader: (15)

If 91 is under $3/gallon, I use 91, otherwise I use 89. Either way, I get the same gas mileage.

jadu

iTrader: (42)

shell 89 see sig.. mines gets the most mpg with it

mEed

iTrader: (1)

ive been using 93 but man gas prices have risen up so much! its 3.59 /per gal over here in chicago!

SC_coupe

I've always thought the message on the USDM clusters was pretty self-explanatory. I prefer to use Shell 91 or Sunoco 94 in both of my cars.

t70 supra

iTrader: (-4)

93 only i put 89 in my car and got a CEL just decided to come on so rather then to play with fate if u cant afforid to drive it then u dont need it my man

NEbiker10

iTrader: (1)

91 or 93 at Hess....car runs like a dream with Hess...runs like **** on Gulf

ucmysc400

true to that but lately ive been using 93 and paying 3.35-3.48 in the suburbs

johnboyjh

Octane has always given the wrong impression to most people. Higher octane does not always mean higher performance. Octane controls the burn rate of the gas. Higher octane actually slows the burn rate thus reduces pre ignition or knock. It's a fine line to walk but you actually want to burn the lowest octane (faster burn rate) without detonation or knock. Cars with knock sensors will retard the timing when it senses knock and that basically will reduce performance. I've found it's probably best to go by the manufacturer's recommendations because most cars now days have knock sensors. As long as you don't get any knock and want to save $$$s and don't mind reduced performance burn the low stuff. Knock is your enemy as is running lean. They generally go hand in hand.

QwkSC

iTrader: (1)

I run the highest I can find. In Kansas, It was 91, but now that Im back in TX I can find 93

Another thing often overlooked is WHO you buy it from. I have gotten bad gas 3 times now from Valero. Never ever from Shell or Exxon or Chevron.