rgsiii said:My impression is that one reason you don't want to run it until empty, is due to the accumulation of crud that could settle in the tank.
On diesel vehicles, it is a royal pain to resart after running out of fuel.
Sucking the goo and grit from the tank bottom is why I try to avoid emptying the tank. More important on older vehicles. In my '72 corvette you can look in the fill opening and see the stuff at the bottom of the stainless tank.