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PostPosted: Fri Mar 03, 2017 12:11 am 
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Joined: Wed Feb 15, 2017 9:26 pm
Posts: 32
Year and Trim: 1998 Pontiac Bonneville se
So,as I'm reading the original owners manual on my 97 Bonneville se,I came across the recommended octane gas to use with the minimum octane rating of 87 is to be used or you can get knocking and pinging.My question is,are there any real benefit to using a higher octane such as 89,or 91 rating?I know a lot of companies use the same suppliers.The choices I have here in Columbus Ohio that are close to me are,Bp,shell,Turkey hill,and speedway.I don't mind spending a bit more at the pump,as long as the car benefits from it.


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PostPosted: Fri Mar 03, 2017 3:05 am 
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Joined: Mon May 19, 2008 7:01 pm
Posts: 16782
Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
Don't bother if the engine isn't tuned for it. It wouldn't be fully utilized and your mpg will go down.

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WHITE WHINE - IT'S INTOXICATING. 1992 SSE Supercharged 236.26 ci (.040 Over)
15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Easy Performance Gen 3 Air/Fuel Calibrator, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, McCoy Motorsports Ceramic Coated Ported Exhaust Manifolds, Fan Override, PowerSlot Slotted Rotors.
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim Trailblazer mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser


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PostPosted: Fri Mar 03, 2017 11:31 am 
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Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
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Location: Chicago, IL
Year and Trim: 2003 SLE
I had my NA car tuned for 93 octane and the difference was barely perceivable.

A stock, untuned L36 will NOT benefit from any thing else short of 87 octane. Don't waste your money, especially when premium is almost a dollar more than regular in some places.

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PostPosted: Fri Mar 03, 2017 1:24 pm 
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Joined: Wed Feb 15, 2017 9:26 pm
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Year and Trim: 1998 Pontiac Bonneville se
Ok thanks everyone,I kinda was thinking the same but needed it confirmed


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