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Old 09 Apr 2008, 08:46 pm
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Default using regular unleaded gas in a honda civic si 2008?

manufacturer suggested to use Premiun gas, will there be a problem down the road if i use regular unleaded gas?
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Old 09 Apr 2008, 09:01 pm
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you should use what the manufacturer recommends..it helps with the knocks and pings in an engine..i think it can cause problems later...
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Old 09 Apr 2008, 09:16 pm
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yes, ur acceleration will be affected, if the manufacture suggests it then try sticking to it. Having a civic si is a performance car for honda
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Old 09 Apr 2008, 09:31 pm
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No, cars today have computers which will control ignition timing to adjust for the octane of the gasoline. You wont have maximum performance benefits but you can run regular 87 if youd like, without any long term problems. If it were a performance car or forced induction car (turbo) you'd need premium fuel.
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Old 09 Apr 2008, 09:46 pm
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ok so even if your cars engine/ computer can handle the lower octane the money you save will not be worth the loss of power and mpg.pay the extra 50 cents a gallon and don't drive so fast.
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Old 09 Apr 2008, 10:01 pm
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the performance of it may probably be a little less than what it should be and the gas mileage you actually get may be less than what the car should get,id try going to 89 octane once and see how it ran most cars the computer will compensate for low octane rated as by advancing the spark on it,but you may notice it pinging or spark knocking,it may be a good idea to stay with some really good gas until it gets broken in real good,good luck with it,and enjoy,those are nice cars.
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Old 09 Apr 2008, 10:43 pm
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Default Re: using regular unleaded gas in a honda civic si 2008?

If you wanted to use regular gas, you shouldn't have bought an Si. You're completely defeating the purpose of getting an Si.

Anyway, higher octane gas is needed for higher compression engines. And by most standards, 11:1 is pretty high.

Yes, your car will run on lower octane. But it won't run great. Your computer will retard your timing and you'll have a sluggish feeling car. Don't expect your car to perform well using lower octane.
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