Crikey I think you last statement can be incorrect, with the emphasis on "can be".
i.e. - If my sunday social is achievable fulled by Gingsters and thats what I enjoy, great. If I'm riding milgrips style, and trying to achieve beast / averages / speed using exertion then incorrect feulling and it won't work.
Its real easy - put 1/2 tank of fuel in your (average) car and try to drive 400 miles - it'll stop. Try to go 10 miles, it'll be fine. Then more marginal, put lesser quality fuel in it and it'll be sluggish or get reduced MPG, better quality more MPG.