I get about 100 miles from 1/4 to E. The miles to empty hits 0 about the same time as the gas gauge hits E. I find if I fill up at E, it will take about ~ 14.5 gallons. The gauge smoothly drops to E, and goes a bit below E if you keep going past 0 miles to empty.

This last tank I drove 713 miles, about 63 miles past E. It took 16.2 gallons to fill up, for a 44mpg tank