Being that I live in Arizona, there is a lot of dust in the air an that does get in your tank. plus when you go to the gas station to fuel up an the tanks at the station are low they're are contaminants at the bottom of the tanks an you pump those straight into your cars tank.
I can't count how many times I've seen people on the side of the road out of gas, there's no excuse for running your car out of gas.
I've run out of gas one time but it was on my ZX-7R that I used to have and I had to push it for a mile an a half. the only reason I ran out was, when the bike came from the factory they put the ON and RESERVE valve in backwards, so when I put it on reserve that was the on position. Never again am I running my tank low.