[CruiseZen]

I don't top off the tank in my cars but often do in my 4 Runner. For some reason the 4 Runner will cause the pump to turn off well short of a full tank. (About 3/4 of a gallon short) I've got 171,000 miles on the 4 Runner and have never had any problems with topping the tank off.

Also another thing to consider, especially in hot weather, is thermal expansion of the gas in your tank. Underground in the storage tank, the temperature of the gas is likely near 52 degrees. Once it is in your tank it will warm up to air temperature and gasoline will expand as it warms. This shouldn't be a problem if you continue to drive your car for awhile after your fill up. However, if you fill up and top off right before parking the car it could cause some of the problems others on this thread have talked about.