Wherever possible I use Shell V Power, or equivalent, in the 4/4.
I plan to continue for as long as it remains available.
Yep, I always put 98 octane stuff in mine. Not had a problem yet, but I carry Classic Valvemaster Plus and I'll stick a shot of that in if I have to use E10. But it's only the fuel filler pipe that's an issue for me so I've got no great worries.
