Jazznewbie been quite a few tests that showed 98 and 95 premium gives you 5% more kms than 91 unlead and at least 10-15% more than the ethanol crap. Round my way if 95 is within 10cents of 91 I will use it every time. If 98 is within 5 cents of 95 then I upgrade to. I know it sound a bit weird but my FD1 gets over 700km out of a tank so I must be doing something write. Cheers