Hi, sorry this is a really newbie question but... my car seems to be not responding well to WOT and although I don't think I hear any "knocking" I still believe it could be pulled timing since it feels alot like it. Anyways I use the lowest octane gas, just because I thought without any mods or anything it wouldn't matter but I'm going to go higher and see if I notice a difference. My question is.. what do I do? Just go fill it up with higher octane fuel? I don't need to do anything special like fully drain the tank? It's ok to mix a bit of the "crappy fuel" in with it? I searched but this is such a dumb question I couldn't find it, thanks!