http://www.optifuel.co.uk/public/86e9a97a-845d-49cf-9b3c-386040ef1044.pdf shows the difference between all optifuels
http://www.byronfuels.com/pages/products.html shows all the byrons main 1 to look at was the race gen 2
hope they help with the comparisons and i'm not sure about the tunings as i'm just breaking in my hyper 7