This is more a different twist on an old topic, but I found the numbers interesting. I like old stuff that works, so I carry a Zippo lighter. I have a routine of refueling it every Sunday. I tested just how long it would go from filling to failure to light, and it was 10 days. Fuel evaporation is the culprit, and somebody else had suggested a fat rubber band around the case to seal the fuel vapors in. That's great, but I didn't have any rubber bands that would fit. I had also noted that my lighter was the only piece of gear on my body that wasn't clipped, strapped, snapped, or dummy- corded to me to prevent loss. (Try fishing a slippery lighter from between the seat frame and console in the dark with cold hands and you'll see why I hate this.) My solution isn't pretty. That has turned out to be a good thing. I have been slipping my lighter into the thumb of large blue nitrile glove. The fuel discolors the glove to an unpleasant brown. This may be an advantage if I was to drop the lighter, since nobody is likely to pick up an icky looking rubber glove. I find it is far less likely to slip from my pocket, and if it should, I have the glove to grab hold of. This makes it harder to lose my old friend (again) in sand, water, down the back of the wood pile, or in some strangers car. Oh, but the best part was the fuel life. I had to go back and look at a picture I took when I had first fueled the lighter and slid it into the glove. It failed to light on the 29th day. Not too shabby for a 52 year old lighter!