I saw upto 10 when on max advance with revo. Set to 7 now and get around 6 or so with 99 RON and a fmic. Thats the bam.
i can live with occassional 2s and 3s. i got the willys when i saw a 5 pop up when i experimented on 2.25*
with 2s and 3s ive got headroom for "less than ideal" conditions. may even consider colder plugs. or i may just leave it lol
and spotty pistons = bad....