The Toyota Prius Generation II (XW20) is arguably the most important hybrid vehicle in automotive history. Introduced in 2003, it abandoned the awkward sedan styling of the first generation in favor of a highly aerodynamic 'Kammback' liftback design (Cd of 0.26). It debuted Toyota's Hybrid Synergy Drive (HSD), a massive leap in efficiency and drivability. This generation cemented Toyota's reputation for bulletproof reliability, becoming the vehicle of choice for taxi fleets worldwide, with many units easily exceeding 300,000 miles (500,000 km) on original powertrains. While its driving dynamics are uninspiring, its engineering is a masterclass in durability and low running costs.
The Toyota Prius XW20 is an automotive icon and one of the most reliable used cars money can buy. However, buying one today means purchasing a vehicle that is 15 to 20 years old. The internal combustion engine is virtually indestructible, but age is the enemy of the High Voltage battery. Buy with confidence, but only if you factor in the potential cost of a replacement HV battery (or verify it has been recently replaced with OEM modules) and immediately install a catalytic converter anti-theft shield. Avoid examples with severe oil burning or unresolved dashboard electrical gremlins.