Reply to "Fuel Question"

I am in Canada and locally I have access to Petro Canada Ultra 94 with Ethanol and Shell V-Power 91 without. I haven't had problems with either, but am loyal to Shell and know of quite a few strong motors that don't have an issue on it. A couple years ago I was reading a few forums on which was better of the two. Of course there is lots written on the ethanol vs non and I came to find the story of a small time independent circle track racer (I can't remember if it was dirt track or pavement) that was in a class that couldn't run race fuel. He was quite competitive that year and was fighting for sponsorship. He said being an independent at the time and having to watch every dollar and make every race point count he had quite a few things broken down stat wise. In regards to fuel he said he was consistently getting a lap to a lap and a half more out of the Shell 91 vs the Petro Canada 94. He wouldn't have been pushing high horsepower in his class, but I thought it was an interesting statement.