There are many who say that fuel goes off. Fuel doesn't go off, it gets contaminated. I've had fuel, (gas and methanol), stored for years without any performance issues when used.
Methanol based fuels smell much better than gas. I have all my models, (gas and nitro), stored in my model room and I don't notice smells from any of them.
I also very rarely change glow plugs. Mostly it's because it's been so long, that I replace it as a matter of course.
049flyer - Only charge your glow driver twice a year. I presume you have the RCATS? That's the best thing I ever bought.
bzyguy01 - There's no need to run a separate battery/switch for ignition. I use the Tech Aero IBEC straight from the Rx and have never had a problem. CDI/electronic ignitions on nitro 4 strokes makes them much more fuel efficient and gives more mid range power. My CDI engines use around 1/2 the amount of fuel as the glow version. Still not as cheap as gas though.