Wow
My friend is a racer and has his own workshop with his dad, and a while back he did some tests on different fuels. I can't remember all the results but i know BP was at the top and Caltex near the bottom. At the moment i use caltex 95 or 98, but after he told me the results and hearing your story i might make the switch.

As for Accord Euros, my Dad's is approaching a year old and it hasn't had any problems at all. I first thought it had a speaker problem but it turned out that the input volume on my ipod was too high for the car's stereo so we had to turn down the ipod and turn up the stereo, and it was all good.