if you go to the Power Service website
http://www.powerservice.com/ and click on the grey bottle display on the right hand side, you'll see at the bottom what the mix should be. I think 16 oz & 8 oz worked out well for Drew so thats what he stuck with. I've tried a couple of different mixes and found no difference compared to the 16/8 mix. the nice thing about it is the numbers work out nicely when your splitting up either a 32 oz bottle or 96 oz bottle...