I've heard that driving to near empty is more likely to push gunk sitting at the bottom of your tank into the fuel filter... maybe that's just a myth though?
My car reminds me when there's 80km, 60km, 40km, 20km left. It's supposed to anyway, the other day I noticed the fuel light was on, checked it manually and I was down to 24km left! Had to turn off the a/c and ease off the pedal a little to make it to the next station.
