I'm so Blonde

So I hop on I45N to Houston yesterday, not realizing how much gas I have consumed with all this driving. I hit a big slowdown and notice a light is glowing on the dashboard. That's all I need is to run out of gas and have the city of Houston tow my car away. No doubt, you can go awhile with that light on but I don't know how long and in a panic fly down the exit ramp to a shell station.
Thank goodness there was a store there or I would have had a full blown anxiety attack for sure.