The manual says there's a low fuel light, plus...

When one segment remains on the digital fuel
gauge, only one segment will blink. When no
segments remain on the digital fuel gauge, the
fuel gauge symbol and the scale will blink.
Also...

Also anyone notice when the gas gets below half tank it seems to go down to empty quicker?!?
Yeah, that's normal. Every car I've ever had did the same thing. Typically I can drive ~1/4 of my normal tank range before the gauge even moves off the "full" mark!

Hey - you should get a pic of your Micra and make a garage entry: add car