I'm running my recently rebuilt engine on E5 and am trying to decide what petrol to use long term before rolling road tuning.
I was going to carry on with E5 as it's widely available. However if it is replaced by E10 I'm not so sure I want to use that. E5 may be sold alongside initially but will surely be phased out in a few years and on small forecourts such as the one near me will probably disappear straight away.
I would rather use Super in many ways with it being 0% ethanol and higher octane as the higher octane would allow a more optimised ignition advance to be used. It is more hassle to get but more importantly will it be available in the future or will it be phased out soon as well leaving me with E10 as the only choice anyway.