I had a small argument with my friend last night that owns a Stang, a fast one I'll give him that much! He says that it is best when the fuel injs. are running at like 60-70% and I was saying that it should be more in the range of 80% for optimal performance.
I am not an expert so maybe I was wrong, anyone know what the best number is?

Don't know the answer to that one Carston.

I would say that it's around 80%