Quote:
Originally Posted by RimasRS
I guess something like that. In location where I live there is a petrol which rated as 93 but it's a mix with 15 percent bio ethanol and it's a bit cheaper even than 91. So I think 93 octane reached by mixing 91+15% ethanol and now it is rated like 93 octane if you know what I mean.
My question is it better than clean 93 safer stronger?
P.S. I know that E85 (bio ethanol) is not good for rubber seals and things like that.
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Depending on your location the way they rate octane is actually different. You likely wouldn't harm anything in your car by running a low mixture and may boost your detonation resistance a bit, but you can give it a try and log your car to make sure. Yes, E85's high ethanol content it is bad for seals over time, but if you are running a low mixture with pump gas it shouldn't be too bad. Over an extended time of continuously utilizing it you may notice it effect the car though.
-Josh