Oh I know your feeling buddy, I have more or less 1600 hours of playing right now, I've been to Sag A*, traveled a lot, never ran out of fuel..
Then yesterday, I was in my FDL, jumphonking to get a commodities for the Engineers, and I actually ran out of fuel.. I felt idiot, I called the fuel rats for the first time and damn it was cool and quick, I don't regret it at the end, it's a must do in a Commander's life.
Fly safe. o7