When my warning light comes on I commute for two more days before filling it up. The gauge is completely useless. "E" is about 1/2 tank. The warning light is almost useless, but it seems to come on at about 1/4 tank.
When you run out of fuel, the engine will miss very, very slightly. In less than a mile you will run out unless you are on a hill. It runs out sooner uphill, and runs out later downhill.
After it runs out, it will restart and run for only a few seconds. If you wait about fifteen minutes and restart, it will run for ten or twenty seconds. After filling the tank, it will restart immediately without having to crank it over and over.
I usually fill up at about 325 miles. I've hit 370 miles on the freeway, but I've also run out at 295 miles when I've been driving all frisky-like around town. (Having a few extra gallons in the trunk sure does inspire confidence in testing these things.)
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