My very first car was a Geo Metro, which got incredibly crazy gas mileage. Like I had to fill that thing up once every month or two and could usually drive it for days on end with the needle burying into the E. Now, older Metros are going for up to $7000 because their incredible gas mileage is on par with a hybrid like the Toyota Prius.

So how far can your current car keep running when the empty light comes on? TankonEmpty.com might have your answer. Do a search for your car's make and model and most likely, someone out there has recorded how long they were able to run once the car told them they were in dire need of a fill-up. Of course, this is subjective, since I'm sure that most of these people did not actually run the tanks dry and it's more of a matter of how long did they go before they felt as if they were going to run out. Still a handy resource in these gas-strapped times.

Link to TankonEmpty.com