In the month I've owned my Prius, I've driven 439 km and used 8.8 L of fuel. That's a fuel economy of 0.5 L/100 km. My old BMW got around 12 L/100 km, for comparison. Most of the time I don't even use gasoline, because she can run about 35 km on battery power, and I rarely drive farther than that in a day.
I also haven't named her yet—until now. I'm going with Hana (はな or 初夏), which means "early summer." Fitting for a car meant to help prevent global warming.
She's still this pretty: