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Old 12 Apr 2012, 01:32 am
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Default What gasoline grade should I use for a 2012 Honda Civic Si?

The manual says Premium which is at least 91 octane at the Sunoco station by me, but will using a 93 octane make the driving experience any more fun? Is it good/bad to use 93 octane on a 2012 civic si? How's the mpg on 93 vs 91? Also, any experience or thoughts on higher octane (94+)? I just can't seem to find any good responses on how this car performs or is affected by higher grade fuels vs 91 octane. Thanks in advance for any informal replies!
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Old 12 Apr 2012, 01:50 am
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Go with 93. It burns slower and cleaner.
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Old 12 Apr 2012, 02:03 am
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91 or above will be just fine. running 93 you will get slight power gains, but nothing too noticeable. it will burn cleaner. running too high of an octane though will make your car run hot, and could burn your plugs or cause other damage, as if you tried to throw racing fuel in there, you would blow the heads right your car. learned the hard way in a 96 integra. going from an 86 octane to a 92, i got a slightly noticeable gain in the car, as well as better gas mileage, but only because the car had the little extra power so as to not have to work as hard to pull the car, resulting in better mileage. but if you rod on it all the time to have fun, youre obviously not going to get better gas mileage. but it still is fun...
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Old 12 Apr 2012, 02:26 am
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Once you reach the specified octane level higher octane makes no difference. Some cars will light the check engine light for a while, with a "fuel trim" code, if excessive octane is used but Hondas are not usually that finicky.































93 octane burns at exactly the same rate as 91 octane. That is a common point of confusion. Octane is about auto-ignition temperature. As the mixture is compressed, there is a point where ignition spreads by the pressure front rather than the flame front, resulting in detonation. That point is at a higher compression/temperature for higher octane gasoline. Otherwise the two are the same. In your 2012 Civic (and all 1996 and later cars and trucks) knock detectors cause the ignition timing to be set back sharply if the beginning of detonation is detected. That reduces power and fuel efficiency. You certainly may try 93 octane and compare fuel costs with 91 octane. If you find you spend less money with 93 octane than with 91 octane, you have your answer.































I highly recommend using top tier gasoline brands. Sunoco is not on the list (first source). Random gasoline leaves deposits in the intake and combustion chamber that can be big trouble.































www.toptiergas.com
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Old 12 Apr 2012, 02:41 am
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The octane level of gasoline tells you it's ability to resist engine knock. High performance engines compress the air/fuel mixture more and are prone to this mixture igniting prematurely. Higher octane gasoline is more resistant to premature ignition (engine knock) during the compression stage of the piston stroke. However, if you live a mile or more above sea level, you don't need high octane gasoline. Since the air is thinner in higher elevations, the air/fuel mixture can't be compressed as much as it can be at sea level.
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Old 13 Apr 2012, 06:02 pm
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Default Re: What gasoline grade should I use for a 2012 Honda Civic Si?

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Originally Posted by syndrome666 View Post
The manual says Premium which is at least 91 octane at the Sunoco station by me, but will using a 93 octane make the driving experience any more fun? Is it good/bad to use 93 octane on a 2012 civic si? How's the mpg on 93 vs 91? Also, any experience or thoughts on higher octane (94+)? I just can't seem to find any good responses on how this car performs or is affected by higher grade fuels vs 91 octane. Thanks in advance for any informal replies!
just use 91 like the manual says. Anything higher might make you feel good, but it's just a waste of money. As said above, you only need higher octane if you're running higher compression, so that you don't get knocking. So if the manual says 91, you need that and not a lower octane like 89, but you don't need to pay more for 93.
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