Oh wow, bargain!

Why am I looking at ex-police cars for value, when I can get an ex-NYC taxi even cheaper!

Ford Crown Victoria
Mileage: 299,000mi (480,000km)
Make Year: 2006
Price (US$): 1700

Ford Crown Victoria
Mileage: 364,000mi (585,000km)
Make Year: 2004
Price (US$): 1200

What could possibly go wrong..