[WardL]

Using K&S leaded 110 racing fuel or Toluene is not the same as a can of additive. I would expect your high compression Cobra to run better on the racing fuel. I wouldn't run pure Toluene in my $10-$20k engine. Pure Toluene does not have the proper light components for easy starting and smooth acceleration. I expect a little Toluene would be fine, but not 100%. Funny thing is when they blend racing fuel it is blended to suit a specific engine size and type. Most racing fuels today have alcohols. Pure Ethanol is like 120 octane and NASCAR fuel is 15% ethanol. E85 is about 100 octane. But this is really a different topic.