All gas cars can get big range numbers like the headline with a bigger tank. It is 81mpg with an empty battery though which is the more impressive stat.
My car is nearly 10 years old, so either I somehow managed to obtain the world's best Prius (with no loss of hybrid battery capacity over time), or you're underestimating the capabilities of today's hybrid gas-electric vehicles.
IMHO, in reality, anything between 300-600 miles of reliable range is fine for a car that uses readily available liquid fuel. That seems to be where the US market seems to have optimized for in the past few decades.