LS-ONE_DAY

Think of it this way...(using my location as an example)

Regular - $3.99
Medium - $4.10
Premium - $4.22

Say you fill up 10 gallons, thats 39.99 total using regular and 42.22 using premium. Does that $2.23 difference between the two really matter cost wise? No.

Stick with premium.

02WS6_Publix

I totally agree that we should all run 93/Premium to keep our cars in the best posible condition and also to save when it comes to MPG.

777

iTrader: (21)

Also think of it this way too. For every 1 mpg you lose (at say 20mpg average) you are losing about $2 per fill up. About the same as switching to regular gas over premium. I would imagine you would lose 2-3mpg, so now you're spending about $4 more to fill up with regular than you would premium.

Math: 20mpg x 10gal = 200 miles per fill up. 19mpg x 10gal = 190miles per fill up. Net loss of 10miles. 10miles / 20mpg = 1/2 gallon of gas. 1/2 gallon x ~$4 gal = $2

Firebirdmuscle

iTrader: (16)

93 all the way. Filled up this evening from 1/4 tank. $42.00 filled up all the way with 93.

UAE_Z28

iTrader: (14)

I fill her up with 95, is that considered as overkill ? the next option is 91 or 98

240sxls1

one thing not mentioned as running lower grade gas you can have emission issues lower grade gas will produce more carbon which can clogg up your egr valve so u might want to check that because it will also reduce your gas mileage

perf0rmance

iTrader: (5)

You should always run the octane rating for which your car was tuned for i.e. stock tune = factory recommendation.

Short lesson:
Octane rating relates to resistivity to ignition. The higher the rating, the more heat is needed to ignite. This is especially useful with boosted applications.

Typical results:
Lower octane - pinging/pre-ignition
Higher octane - unburned fuel

Running too low of an octane can cause your fuel to pre-ignite before it should.
Running too high of an octane can leave unburned fuel in the chamber.

BIG_MIKE2005

iTrader: (116)

LOL, you guys are gonna cringe when I tell you this.....I run 87 in mine, LMFAO. And here is the kicker, no knock & no other issues. Been running this combo for 80k miles on 87 octane from a station that only sells 100% gas. Car never sees ethanol, when I did put gas in from a ethanol station I got knock. I used to spend the coin on 91 till everyone started dumpin 20% ethanol in it. When I switch to this 87 I run now I got throttle response back, MPG back, smoother idle & no loss in power. Trips to the track backed up my no loss of power with consistant ET's.

I'm not exactly sure why I dont have issue or if I even should have issues, I just know this gas works just fine for my NA car. Now if I was gonna be boosted or spraying i'd spring for a higher octane. but as of right now till my car gives me reason to spend more at the pump I'm gonna keep rockin 87.

perf0rmance

iTrader: (5)

Unless you can clearer record/track knock, the PCM may be pulling timing. It doesn't mean what you're doing doesn't work, but I'd say it's less than ideal if the factory calls for a different octane rating other than the one you are using.

NOTE: using octane booster does very little in actually raising octane

BIG_MIKE2005

iTrader: (116)

I have a Aeroforce scan gauge that monitors knock/coolant temp. It has been looked at and had basic edits done like rear O2 delete, skip shift delete, Air/EGR delete & so fourth. I believe the guy even took a couple degrees timing out cause when I had the edits done it was before the H/C/I swap & I was gonna hit it with a 100 dry shot.

Maybe that pulled timing is whats helping, who knows. I just know I only see slight knock if I'm in 5th & start goin up too steep of a hill without downshifting. But according to the scan gauge its minimal knock even then.

216StealthSS

yes sir! owned the car 3 years and never put nothing else but 93 v-power! i get a avg of 19MPG.

mandatws6

Was thinking about if it matter. Thanks for info

RebelExtrm02

iTrader: (3)

I'm fortunate enough to live in a city that has a gas station with guranteed no ethanol 94 and I pay whatever they want for it. It's just not worth the $4 difference over a whole tank to get the crappy stuff, especially since my car is modified and tuned to take more advantage of higher octane fuel.

arob987

iTrader: (9)

93 here

Cstone812

iTrader: (5)

Only way I would put regular in it is if my car was completely stock and my daily driver...if its your weekend car or is modded out the *** PUT 93 IN IT otherwise why did you even buy the car?

/thread

BillyMitheRxguy

iTrader: (1)

premium or race fuel is the best