What can I carry to use as an emergency octane booster (anti knock) for use when when premium (91) is not available and I have to use regular gas (87) to get me back home ? 2 stroke oil ?, TEL lead (can I even get it in northern Ontario). I have ran about 80% regular a few times and I have never heard pinging, but these are noisy motors and I don't know if I would hear it. I don't race so I don't care about loss of power, I just want to protect the engine, yet carry the lightest, smallest container possible Are there other options ? unplug the TPS ? Richen the fuel screw ?