Yeah i have used it... Did a bit a research into it it also.....
It is firstly a fuel stablizer made for americans when they winterize there boats and motors....
Obviously over in the USA and Canada, during winter the lakes are frozen and the air is way to cold to go out on a boat. So they lay up the boat for winter....
What the 2+4 does is stablizes the fuel so it does not go off (Lose it's octane rating) during the winter, which my last up to 5-6 months....
It also acts as an octane booster....
What it wont do is reverse the effects off already old fuel that is stale....
It is good gear, and very cheap....