i have a 09 m8 and i normaly fill up with 87 octane from fas gas but i ordered a head kit that wants 91 octane. i want to know if i can or should run the mohawk 92 ethonaol enriched gasoline? they only make 90,92,94 octane but all with 10% ethonaol in them?? what should i do i live in british columbia. i have heard that our 91 octane gas might not be what they claim..i just don't want to blow up my motor.. can someone teach me about this..