New forum member so I'm coming late to this thread: I would offer some thoughts though as I'm not entirely happy about going with E10 petrol.
Surprised (if only because it has a steel fuel tank) to find that my 1960s Howard rotavator's American Kohler engine is supposedly 10% ethanol ready ! Most of my other kit is relatively modern (apart from 2-stroke Mantis tiller) so probably OK to run on E10. BUT I plan to buy high octane E5 mix in future (unfortunately @ premium cost - I have a question later* about high octane E5 in a moment though).
Garden equip' unlikely to go through fuel routinely like a car say, so, it seems to me, E10 in garden equip poses increased risk of absorbing water into the fuel over even short lay-up periods. Of course E5 (5% ethanol) still has potential to absorb water, but I guess we have been living with E5 long enough to know it is "manageable" !
I believe there are some additives one can add to E10 to help prevent degradation (not fully explored yet), but seems to me that an E5 formula will be easier to manage.
Anyone additional thoughts anyone about E10 versus E5 ??
*And as regards high octane E5 ("super-petrol"), any general recommends please for carb' adjustments in small engine garden equip' (either 2-stroke or 4-stroke) ??