I always get amazed that all of the eastern bloc has better petrol than the US although you can still buy 80 octane petrol over there. The regular stuff over here is 95 octane and the good stuff 97-99 depending on where you fill up
When I was 18 and had just gotten my first car (a 1988 Volvo 240 in white, hey I was living in Sweden!) I rarely filled up more than half way as I had petrol nicked a couple of times out of it despite having a locking lid. Not filling up properly is silly though as you will have to do it sooner or later anyway.