Yah Jim. The pinging went away at the lower levels but I just couldn't get the power I had with raw octane no matter how much lead I added. Kind of like when your car is running hot and you are getting robbed of power.
Greg, I went to college for chemical engineering but I think you would need to be a special kind of chemist to know about that mixture! I did understand the article on specific gravity of todays fuel in High Performance Pontiac this month. It basically says that todays fuels are 'all over the map' as far as density and how good a particular brand is. They recommend to stick with the major brands because they have more accountability with their product than the discount brands. The good ones are like Sunoco, BP, Amoco ect. because they have the fuel from the crude stage all the way to the finished product. One thing that is a let down is that the higher the percentage of Ethenol the lower the specific gravity. That makes it less dense and have 'less bang for the buck'.
