Anyone using something like nitrogen in their fuel to try and keep the bad air out? I've noticed once I get to the bottom of a jug my engines start to run finicky. I was thinking putting a gas layer on top of the fuel might help preserve it to the end. I don't get to fly as often as I use to and it can take me a few months, or maybe longer to get through a jug of fuel. I would like the bottom of a jug to burn as good as the top. Thanks.