Some of you pimply faced punks don't know jack about engines , combustion or jack. Your injectors don't know what octane you put in the tank so it squirts the same amount if you're using 87 or 93. The 87 probably burns too fast (too hot) so the timing gets retarded. If you use 93 the gas burns too slow. Not all of the fuel gets burned at the right time. This results in less power Use what you need for max power.
Even the guys at VP Fuels found that high reving motors made more power with lower octane fuels.

 

Actually, the price debate is nearly worthless. At 20 cents more for premium, pumping 20 gallons of it instead of regular would cost $4 more. Annually, that's a difference of $171 for a vehicle that averages 14 miles per gallon — as some big sport-utility vehicles do — and is driven 12,000 miles a year.

The argument here isn't about which makes more "power" or is "better". It is proven that a higher octane fuel has higher combustion properties and will react more completely as long as the car is designed for it. Premium gas is really just known more for its "anti-knock" properties.. and if you ask me.. $171 per year just to ensure I'm putting the cleanest and best gas in the car possible as far as wear and tear on the motor. It's just one more small thing us car lovers do for our babies to ensure they've got the best.

There's absolutely no use being a douche canoe and calling us pimply faced punks? I am a current Mechanical Engineering major and I do know what the hell I'm talking about. We're talking nickels and dimes here.. and the slightest difference in power. So cost and power differences aside.. premium DOES give better power for the G, is only slightly more costly, and it doesn't create as much "knock"... so my recommendation was to go ahead and use it all the time... so instead of being an insulting asshat... pay more attention to what the discussion here really is. It's not a debate.. it's an opinionated question.

 

What's the point of making super unleaded octane than?

 

It is strictly more profitable than the other fuels... for the ~$0.20 more we pay... the gas company only pays another ~$0.08...

Even most auto manufacturers say it's not necessary... but I just use it because the slightest difference is important to me. Really, higher octane fuel is really only needed (for reactivity purposes) in forced induction vehicles... hence why most people boosting their cars go E85 (107 octane +)

 

Modified engines with altered compression ratios, different fuel and timing curves....and possibly the addition of boost. It allows you to run a more aggressive tune and offers a better cushion over detonation.

99% of the general driving public does not need anything more than 91 octane in their cars. All you are doing is wasting $$$

Think of fuel like oil. What was your engine designed to use? There is nothing "crappy" or "cheap" or "dirty" about 87 octane. It burns easier and more completely than 93 octane. The prob is it tends to pre-ignite requiring an engine to use a higher level to resist burning until the spark ignites. The only time you may need more than 91 is if your engine is full of carbon deposits which tend to retain heat between ignition cycles causing pre-ignition. In this case, the use of higher octanes is due to poor maintainence.

In a car like the G35 sedan, it's premium (91) recommended. If you didn;t have a knock sensor, and ran less...you'd detonate. The knock sensor pulls timing and fuel in order to save the engine from destroying itself. But...what happens if your knock sensor ever fails with a tank of 87 in the car??

 

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