Here in the UK, the 'super' fuel is staying at E5 for at least 5 years (so they say!). Shell, BP and Asso all have a 'super in their range; in most parts of the UK, according to their web-site, Esso 99+ is ETHANOL FREE. This is the fuel that I use in my tuned 500(659cc '126'engine) and is what I would reccomend for all classic cars. As Ryan suggests, try and find a garage that sells fuel with the lowest ethanol contant,even if it the 'super'grade