I tuned on 91 with shell On a dyno ,car started to knock, tuner asked me what gas a put in the car i responded shell , he then told shell is good for normal driving with oem tune but once the car gets tuned he told me not to use shell its not good gas for tuned cars he has had many problems with others filling up with shell and tuning the car i believe him because he is one of the best tuners in the island specialy with Hondas again im only referring on tuned cars not stock . Could be all the cleaning additives mislxed in thats just me saying .
Thanks for the explanation. I wonder if it is due to the cleaning additives. Im surrounded by shit gas in my area. Lots of Kwik Trips and Holidays, very little Shell and BP.