Thinking about buying tenacity, how would I manage to use a whole gallon?

I have been debating buying tenacity for a while now, I have heard many great things about it but the fact that half a teaspoon makes one gallon that only lasts 24 hours makes it somewhat unappealing to me as my lawn is too small to use it all. I was wondering if it would work (at least partially) for weeds in between pavers, since then I would be able to get more use out of the gallon. If anyone has found a way to make it last longer while diluted or a way to use it for other things aside from lawn weeds, that would be appreciated.