Yeah I have been following that thread as well, interesting with differences of opinions... I don't think we ever logged duty cycle on my 1000's but the AFR's were good and never running lean.. however I do know they were totally maxed out on 600rwkw.... The 2000cc ran perfect on E85 however just ran too fat for me on pump 98 which I run with 90% of the time.. A lot of my driving is around town in traffic,light throttle etc.. When we pulled the head off, there was a fair amount of carbon build up....Since we don't have a lot of servo's with E85 up here and I didn't want to buy drums of Sucrogen, I decided to go back to 1000's... I am over chasing dyno figures now, and just want to have a nice E85 tune around 25-26psi anywhere between 500-550rwkw so I can finally take it to the track for a bit of fun.