I've noticed that Howard has a vertically bent tube similar to the Uniflow inlet, for the overflow. It points down, but it's up high, where he can see that it's been un-capped for fueling, capped for flying.
He hooks a tubing onto it from a little glass jar, squirts the overflow into the jar. At the end of the day, he dumps the jar back into his gallon jug...I asked.
This prevents mess on the model and flying field, environmentally friendly, saves $. We all should get onto this trick. I would, however, suggest use of a poly bottle or just an 8 oz clunk tank, purchased at a swap meet. There's also no reason that a longer hose couldn't be run straight back into the top of the gallon fuel jug.
Steve