Filled up regular gas by accident
Just filled up, and they gave me regular when I asked for premium. Should I run the regular gas down before I refill, or run it to half the tank to diffuse the regular gas with the premium my engine recommends?
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Does your car require premium for some reason?
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If it does, don't sweat it. Just start putting premium in it from now on.
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yeah, my manual says 91 octane or better... i'm not too worried about it... i used to put midgrade in regularly... but just wondering if anyone had any tips or thoughts...
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It depends on the engine. You would get much better information if you looked on a site or forum specific to your car. I have no experience with the Toyota 2ZZ engine specifically but it being a modern engine with knock feedback, I would assume it would be fine to do as long as you don't drive the motor hard.
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Being the 2zz engine the effects will be minor on your engines since its only one fillup... Dont hit lift during this tank and probably shouldnt rev over 3k rpm until you get a full tank of premium in..... You can also buy a bottle of STP octane booster to help your regular gas run a little better.
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I second the octane booster. If you are that worried and just put some in and shake the car as best as you can.
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"...shake the car as best you can." Cute.
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I also would suggest the octane booster if your owner's manual requires the 91 octane. As BDC points out your onboard computer should have a knock sensor that will retard your ignition timing, alter your fuel mapping, possibly change your valve settings if your engine application has that option any one of which will affect your engines performance but should protect it from potential damage from using a lower than specified octane rating. A bottle of Octane booster from your local auto parts store shouldn't be too costly, pick one up, add the amount recommended for the amount of 87 octane that was added at that fuel up and top it off with 91 to mix the booster into the tank and you should be fine.
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Octane booster
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