This may seem a dumb question but im just curios if i am wastin my money or wat..

What do you guys think the best octane is to use for my 91 3.1,.... no mods ...

I use 92 jus cus i figured it was cleaner or somtin, does it really matter?... i tried Sunocos 94 octane **** and it caused me to lose alot of mpg...

Thanks fellas... and ladies.. if there are any

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91 3.1 RS.
T-Tops
12" tube in the "trunk" (That hole they call a trunk anyways)
16x8" ROH Rims
Firehawks all Around
New BOSCH plugs and wires.

Itchin for a SLP Cold Air and new catback.
Dynomax or American Thunder... dunno yet.. suggestions?

 

Without mods your compression ratio theoretically dictates 87 octane. Run your car almost empty, fill up on 89, see how it changes.. run that almost out, fill up on 87, see again how it changes.. figure out what your car is happiest with. Mine personally loses tons of power and milage on anything but 87.

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: Pioneer DEH-P3000, two 12" Optimus Pro Audio subs in hand-made enclosure each powered by a 260 watt Optimus amp. Working on shaving the box for weight.
My Homepage, with pics.

 

I have to use 93-94 octane or my car makes wierd clicking sounds. It sucks cuz its more expensive but only by like $.10/gal. My MPG sucks. I put at least $10-$20 in a day. Ofcoarse i've put about 35,000 mi on my car in about 6 months so I probably just drive too much. Sux being the only one in my group of friends with a car.

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1984 Black 2.8L LC1 Camaro SC
mods: 160* thermostat, CAI, stock V8 2 1/2" dual exhaust, Bosch Platinum +4, 8mm Accel wires, GTS taillight blackouts, Cool Blue headlights

 

My car used to -hate- Sunoco 94. I'd lose power, and the car would ping like crazy. But now, after the MSD 6AL box, I can use the stuff- and it feels like it gives my car the biggest boot in the butt! My car used to love Exxon, now it acts like a dog on it- but the tank of gas lasts forever. Go figure.

Oh- I run the high-octane because my aftermarket chip (ADS) tells me to.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

I run 92 in my 2.8? My milage sucks, but i have never tried 89. Could this make a difference? Is it bad to switch octane ratings like that?

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1987 Firebird
173 2.8L V6
Flowmaster Muffler
The rest stock.

 

Use whatever octane goes with your compression ratio. Or whatever your car likes. My 89 had 89 in it its entire life, and wouldn't run good on anything else (go figure!).

Vman

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1969 Camaro Sport Coupe
383, 700R4, leather, everything black but the lights

Previous owner of an 89 RS Camaro
2.8L V6, 700R4

 

What are you guys payin for gas im probly gonna take out my FAST CHIP so i can run 87 again its at over 2.00 a gallon for 92 and 1.85 for 87

 

wow...1.70 for 92, 1.47 for 87, 4.10 for 110 (racing gas hehe)

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1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers (ready to install), Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil (Fireball in future) Accel 8.8 wires, MSD Ignition Module, 4th Gen Seats (not front yet)

" I'd rather run last in a full out race, than to NOT run at all ".

 

1.89 87 just barly under 2 for the others

 

graeme, where do u get ur gas for so cheap?

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Stock 2.8 MPFI auto w/ Flowmaster ?? Series (dunno what my dad put in), More to come......
New Pioneer Head Unit
Targa E-910 7-Band Equalizer w/ crossover
2x 10" Pioneer subs powered by 300 Watt Jensen amp
2- 6x9" Pioneer (rear)
More to come..... (hey, i dont got a job yet)

 

1.87 for 92, the others are about 7-10 cents cheaper.

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1987 Firebird
173 2.8L V6
Flowmaster Muffler
The rest stock.

 

arco on desoto and plummer
the racing gas is at texaco on sherman way and desoto

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1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers (ready to install), Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil (Fireball in future) Accel 8.8 wires, MSD Ignition Module, 4th Gen Seats (not front yet)

" I'd rather run last in a full out race, than to NOT run at all ".

 

Could it be a possibility that a lot of us with v6's could be getting bad gas mileage because of the way the computer learned our habits? Say I d/c'd my battery and when I drove the car again I drove it hard to thoroughly test the changes I had made, and the computer learned to dump gas in? This may be from left field but I remembered something about the computer adapting to our style when its reset.

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87 Camaro Sport Coupe
MSD Coil, Accel 8.8mm wires, Rapidfires
K&N Filters, No Air Baffles
Z28 Hood and Rims

 

well with gas you get what you pay for. you buy the cheap stuff you get shi*y performance. Personally I use 92/3/4 octane only. I have noticed a significant diferences between not only octane but the actual name brand..exxon ammaco ect. The best performance and milage has been with ammaco 93/4. I get close to 380 miles to the tank with it. The thing is it is also the most expensive. Its up to you to choose the money per milage and quality.

 

Hey camaro hunter your talking about 380 kilometers, not miles, don't you?

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www.marion-becker-nidda.de
91 Firebird 3.1
Modsynomax ultra flow stainless steel

 

Would 110 Octane hurt my car at all?

 

umm no that IS miles. on the straight highway I can get closer to 420-450. I can fill in illinois and drive to the middle of kentucky on I-64 before filling up then get halfway through VA before refilling.