This is old school about pumps burning up etc etc. we have purge tanks as do almost every modern car I know that the pumps sit in...

http://i39.photobucket.com/albums/e1...psfbfffdc8.jpg

You can drive around till the last drop and cause zero harm since the pump is submerged in a tank of full 100% of the time. Only when fuel starve happens on these cars on right handers does the pump sit dry. Which of course is fast enough to not over heat it and as far as I know, no ones had issues after filling back up.

I had 1 dot this morning... filled up today with 17.8 gal till it kinda spilled a bit. lol