I've never seen the light in mine, so I can't tell you. I always fill up at 1/4 tank. You never know when you are going to get stuck in traffic jam.
And that's exactly what happened to me ... TWICE ... lol
The first time the light was on and I was stuck in a snowstorm-created traffic jam, in the middle of a long line of cars stopped on a deserted one-way-in-each-direction road ... after a few minutes I did a multi-point turn and turned around ... ended up making it with about 18 gallons needed to refill that 19-gal tank
The second time was a few days ago dealing with lots of traffic on the way to the gas station, about 8 miles after the light had come on ... and in my car, the light usually means that I have about 20-25 miles left ...
The most my tank took to get re-filled was 18.4xx gallons
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Mine: '13 Mustang GT, Sterling Gray, 6-spd man, Recaros, Track Pk, 2.3L Whipple, 608 RWHP, 517 RWTQ
Fiancee's: '08 Mustang GT500, White/blue stripes, '13 TVS & injectors, FRPP twin-65mm TB, JLT 123mm CAI, 643 RWHP, 608 RWTQ
Previous: '07 Charger R/T AWD, heads/cam, a few other things. 355 AWHP, 370 AWTQ