I use the bottle most of the time, too, but couldn't resist the great deal (?) I got on the bottles last year.. I thought I would be taking the Q220 to the Auburn games this year to tailgate but it seems that every game has been a 6:30 p.m. kickoff - in the rain - so the plans changed.
Still, last week I needed to do a quick shrimp kebob cook and didn't want to roll the Q outside the garage AND move the tank so I just popped in one of the little bottles.
When I first got the grill and before I got the hose, I was cooking with the little cannisters and like George, I was getting 2 - 3 cooks per.
Since they keep, I doubt I'll need to buy any more for a few years!
Pat