[Putershark]

Your chances of hearing it knock would be slim for a soon as it does (many times well below what you would hear) the ECU backs off the timing about 5 degrees (pending on the computer program mapping) and then tries to bring it up a 10th of a degree till it starts to knock again.

Gashol by nature though, is a higher octane level of fuel due to the blend of the 2 liquids so no shock to me that you burn less of it. Just put a little alcohol on your hand and you can feel the cooling effect... The higher the octane number though, the more stable the fuel, thus the ECU can give the engine more timing which quite simply... Equates to more power

You also have to remember that modern engines are making adjustments to timing about 10 times a second. So even little changes in fuel quality, air temp, humidity, altitude and air fuel mixture are all being taken into play when those adjustments are being made... Cool stuff (programming I would like to learn) and why we can ring out so much power out of such little displacement engines