. I was having a little 2500 rpm ping problem in my jet so I decided to play with some good gas, 111 mixed about 50/50 with 91. I forget to bring the jet kit to the lake. I had it jetted for a 3500 ft. lake in Nebraska so I figured that I wouldn't have worry about being lean at 4800 feet. Well anyhow my question is with all conditions being the same what would be the difference? My boat ran lean and I had to time my way out of it since I didn't bring any jets. I will be running a heavier advance spring next weekend wich should clear up my lower rpm ping but I just wanted to play with some good gas. Well anyhow my question is with all conditions being the same what would be the difference in jetting between 91 and race gas??