Hi all Here in Australia we have a variant of fuel called E10. It contains 10% ethanol and 90% unleaded petrol, and so is a whole lot cheaper. The manual says to use Octane 90 or higher, unleaded. Not sure if Octane refers to the percentage of petrol vs "other" fuel content. I'm wondering if it's safe to use in my 659CC Copen? I drive my Buzz for a living, so I cover a lot of km each week.