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I check the engine hours since the last fill up and times that by 5. When I am a few gallons from that number, I set the pump on the lowest setting. It will USUALLY click off by itself without spilling a drop but not always. Another method is to listen to it and when you hear it gurgle, that means it's about to overflow. But most gas stations are next to a busy road and I can't always hear the gurgle too well.
I run 89 octane per the owner's manual.
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I just use the hours as a check as well. I don't trust the gauge. My buddy just bought a 2003 Super Air, and it has a really neat feature. It's computer monitors fuel flow and tank level and has a display that tells you "hour to empty" like the newer cars do. It is an approximation based on averages, but I bet it is fairly accurate. Kind of nice.
