I monkeyed around with ratios with my 96 Burb 2500 and found that 1/2 oz per gallon was the ticket for me. I also run power services. I am a firm believer in the two cycle. My truck runs significantly better when it is in the tank.

There is a thread in here somewhere where somebody suggested just trial and error running ratios until you started to get the classic 2 cylce smoke out the tail pipe then back it down a bit from there.