I started carrying CO2 about 9 months ago on my road bike. I've been fortunate in having two flats in that time. Both times, I replaced the tube and used a CO2 cartridge to fill the tube/tire. Both times, the tire was fine two days later but after four days the tire was flat. When I used my floor pump to inflate the tire, everything went well and the tube retained air with very minimal, but normal dissipation over the following weeks.

Am I correct in concluding that CO2 dissipates fairly quickly through the tube and after using a cartridge on the road, the tire should be emptied and refilled with O2 when you get home?

Thanks