Slow leak in one tire - replace or keep filling it up till the tread wears down?
The mechanic said the puncture is in a place where it is illegal for him to repair. If we fill it up with our portable air compressor it will last a few days. The tires only have around 5-10k of miles left on them before the tread hits the wear indicator. So keep filling it up manually every few days or replace all four tires now? Or attempt some makeshift repair?