Honestly Iceman, we have now idea about the octane grade of our fuel. However, in my city, there is now one gas station, which just so happens to be in a bad area of town that offers 95. So what do I do? Every fill up, I top up with two SONAX octane boosters (as per PORSCHE's recommendations). Every third fill up I also use an engine filter cleaner.

We used to have a C180 that we had to sell because it simply stopped on the highway due to bad fuel (due to the kompressor or turbo engine).

I had an x6 twin turbo v8 but also had no problems.

A lot of 911s here have stopped at one point o another due to the fuel problem, but I've so far avoided any hiccups.