The flashing light is a final warning to put fuel in ASAP.
I can assure you it doesn't pay to run a car this low. It means you are picking up the stuff from the bottom of the tank. Personally I don't run below a quarter of a tank.
Whoa!, don't panic the guy any more than he may be!
Every car is different! On some, the warning light may come on at 35 miles, on another at 25 miles, on another it may be 15? In my case it comes on between 32 & 30 miles range. In practice, when it does come on, it is telling you the fuel level is 'very low', but you will actually have a minimum of 1.5 & 2.0 gallons still in the tank. When the fuel level falls to 'critical', i.e. you are going to run out 'anytime now', it flashes continuously. It is fair to say that you should not run the tank low as a rule, because as already mentioned you run the risk of dragging up the accumulated crap in the bottom of the tank, and if done on a regular basis, you will block the fuel filter sooner rather than later! Just remember , when the warning light comes on, refuel ASAP, don't leave it until next payday
