Had a drained battery in my Mazda3, and this time, no lights were left on. Strange. (Also beats me why Mazda doesn't install battery protection, this will save them roadside assistance calls/service).
In any case, since this time, my fuel gauge showed empty, and the range showed 0. The tank had about 3/4 gas.
Slowly as I drove, the fuel crept up in the gauge, but the range still stays at 0. This has been a week now.
Any clues?