Wow, that's pretty high! I'd keep it sealed and buy some at a local gas station. As for long term storage, I keep mine from winter to winter ith no problems. I use it in a torpedo heater, Kerosun heaters, and for oil lamps. Those are pretty forgiving as far as fuel quality goes. Maybe do a Google search for kerosene storage? ...and have a report on my desk by Friday.I bought my first 5 Gal. can of kerosene today.At Tractor Supply, it was $50.00. I feel like that was a bit expensive. Am I wrong. It was a sealed can,s0 I was wondering about long term storage.Will it break down over time if its not opened?