The low-fuel alarm typically goes off at roughly the 14.5-gallon mark, which means almost 3 gallons remain in the tank. On my last tank, which was 36.4 mpg, I drove 65 miles after the low-fuel alarm went off, and put in 16.1 gallons, so there were 1.1 gallons left in the tank. Of course that remaining gallon shouldn't be used, but you can see the light goes off very early.

OP, you only pumped 14.5 gallons (55 L). You could have driven the car much further.