The Toyota Prius tops this year's JD Power and Associates/What Car? 2008 UK Car Customer Satisfaction Index (CSI) study.
The Prius scored 901 points out of a possible 1000, with owners reporting particularly high satisfaction levels with the model's quality and reliability.
'The Prius already has iconic status because of its green credentials; now it's demonstrating that it's also the watchword for reliability and satisfaction,' said Steve Fowler, editor of What Car?
'It delivers on many of the points that matter most to car buyers today: it's environmentally friendly and reasonably frugal, yet it's also reliable and a great car to own.'
Lexus topped the nameplate rankings for the eighth consecutive year, scoring a customer satisfaction score of 866. In particular, it excelled in three of the four key measures: quality/reliability, service satisfaction and vehicle appeal.
Honda was the other notable winner, scooping three model segment awards for the Jazz (small car), FR-V (MPV) and CR-V (4x4).
The JD Power and Associates/What Car? 2008 UK Car Customer Satisfaction Index (CSI) study includes 28 brands and 100 models.
Information on the cars is provided by owners, who give detailed evaluations of their vehicles and dealers. These are broken down into four areas: quality and reliability, vehicle appeal, dealer service satisfaction and ownership costs.