Old new car question,please see what you think
I have a 1997 xr7 cougar with a 4.6 v8,it's efi direct injection.I was running 87 regular fuel,then it was pinging,so i ran 93 high octane,it ran a lot better.Well one day i was a little short so i had to run regular 87%.My goodness it ran crappier then ever,it's almost as if it actually got addicted to premium.My question is,i wonder if on an empty tank if i put about 1 pint of Odonnel 20% speed blend r/c fuel in then filled it with premium.Think it would run extremely well or posibly damage either the engine or ever the fuel injectors?I just would like your opinion,i don't know if i really would risk it but i just wonder.Thanks.