50 mm axles are just a fad

"No way, not after a month! Not even after a year! Sure, by then it'll have lost some properties, but it still won't be spoiled! Over time fuel evaporates and may lose a couple octanes (the unit that of its anti-detonation power, ed.), but all that happens is that the blend gets a litle richer and this is never bad lor the engine. My general advice is to always shake the tank well before using the blend, because when they sit, the two elements tend to separate, regardless of whether the mix is new or old."