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Old 30 Oct 2008, 06:31 pm
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Default If i switch back to regular unleaded (87) would i get better gas mileage, ive been

using mid grade(89)in Civic? its 99 auto civic. the manula says use 87 or higher. so ive been using mid grade one for the past few months so i was wondering if i go back would i get better gas mileage?? also, would it hurt my motor to switch back to regular after using mid grade for so long? somone told me it would be bad but the guy is kind of an idot so i dont really care too much what he suggests. he said something about "retarding the engine" is this true.i get good gas mileage but i want better! the civic looks good too though. but i dont wanna mess up motor and if i wont get better mileage than i wont go back to regular but if i stay with mid grade will that be bad for my car too eventually?thanks please answer sonly serious responses
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Old 30 Oct 2008, 06:46 pm
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No you won't.
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Old 30 Oct 2008, 07:46 pm
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Civics run happily on 87 Octane, if you should have any problems with timing (which you won't) the computer can take care of it automatically. And your motor will not be harmed by switching back.
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Old 30 Oct 2008, 08:01 pm
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It will not hurt the car one bit, you can switch around with all of the fuel grades that are 86 and above, in a Honda especially! The car's computer can sense which grade of fuel it is being "fed" and can slow down the injection process if low quality or low octane fuel is used that might cause pre-ignition, but your car is designed for 87 as is.Also 89 will not give you any benefit of fuel economy unless you have an engine with a higher compression than usual, and really the only time higher octane works is with 91 and higher, 89 is generally a scam in my opinion. But again, only for engines with high compression require higher octane fuel, and 87 is perfectly fine for the civic.
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Old 30 Oct 2008, 08:16 pm
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It willniot get better mileage but the lower cost will make it fill like it.
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