Originally Posted by sdsearch

Oh, so in Europe there's no multiple octanes (like in the USA) where some cars can use lower octanes but other cars can only use higher octanes? And all rental cars are compatible with any percentage of biofuel?

I've gotten cars in the USA which say I have to use a certain octane which is not the lowest octane at many gas stations.

And I've heard that some cars in the USA do not work well with high percentages of biofuel (but then in the USA those are not that commonly available at pumps).