View Full Version : 93 Premium Octane Gas Worth It?

09-17-12, 08:58 PM
The owner's manual says 87 Unleaded... Would a bone stock 2012 3.6 perform any better with 93 Premium Octane, or is it just a waste of money? Would the computer recognize the difference and adjust timing for better performance or is it locked down for 87 Octane?

09-17-12, 09:11 PM
I only use v-power in my 08 cts4, runs great on it plus i know the fuel injectors will be cleaner

09-18-12, 11:44 AM
To answer your question, Austin, NO. I bet most people use the 87 like myself and there is no additional power. Just use a Top Tier gasoline such as Shell or Chevron or the others and 87 octane. You will experience no gains or losses in power. None. The only thing a higher octane is allow the compressed fuel to burn more smoothly and consistently under pressure which eliminate "knock". If your engine knocks then you have additional problems that the dealer should check into. The advanced computers we have in our cars will take care of the irregular detonation (should it even occur).

Save your money.

09-18-12, 04:49 PM
I can tell you running higher octane is definitely smoother.

09-20-12, 02:02 PM
There MAY be a slight improvement, but it is doubtful. Unless you are having problems save your wallet. Usually, the people who ask octane questions are the ones who want to downgrade from 93 to 89. Now they may have a slight problem, but it will still drive just fine. Maybe if you live at altitude you might consider a different octane or drive your car hard or track it.

00 ss
09-20-12, 02:26 PM
I live at altitude. We use LOWER octane fuel up here. Regular is 85, mid grade is 87 and premium is 91. I use 91 in my '00 Camaro SS because I get knock retard with lower octane which reduces power. The CTS gets regular and has no knock retard. Unless you have a good scanner, you will not know if you have knock retard or not. It's not displayed anywhere.

Like others have said, the 3.6 is designed for regular gas. Putting premium in will (at best) do nothing and could reduce power because the fuel burns more slowly. To maximize performance, never use more octane than you need to prevent knocking and pinging. Oddly enough, this also minimizes fuel costs. This may be the only exception to the rule that performance costs more.

09-20-12, 03:07 PM
As others said - NO. Use regular gas and you will be fine. Unless of course you want to waste money for placebo effect ;)

09-22-12, 12:40 PM
Some higher octane fuels contain no ethanol, as ethanol contains less 'power' than gasoline an increase in fuel economy and responsiveness may be noticed

09-22-12, 02:46 PM
Still, no noteworthy advantage to any of us. Our cars were built for low 87 octane ethanol blend gasoline.

09-23-12, 08:28 AM

"For E10 (10% ethanol and 90% gasoline), the effect is small (~3%) when compared to conventional gasoline,[56] and even smaller (1-2%) when compared to oxygenated and reformulated blends.[57] For E85 (85% ethanol), the effect becomes significant. E85 will produce lower mileage than gasoline, and will require more frequent refueling. Actual performance may vary depending on the vehicle."

09-23-12, 01:17 PM
Quote from the Federal Trade Commission:

The Low-Down on High Octane Gasoline
Are you tempted to buy a high octane gasoline for your car because you want to improve its performance? If so, take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner's manual.

The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars.

Unless your engine is knocking, buying higher octane gasoline is a waste of money, too. Premium gas costs 15 to 20 cents per gallon more than regular. That can add up to $100 or more a year in extra costs. Studies indicate that altogether, drivers may be spending hundreds of millions of dollars each year for higher octane gas than they need.