With the 9 year rule used Mercs are to expensive to taxi .What options do we really have .Scoda .Prius Partner .The range of Hybrids is limited so are diesels .Im thinking cheap as chips 6 or seven year old petrol car cheaper to buy more expensive to run cheaper to maintain .If you are buying at the tail end of the market say hoping to get 3 years out of a car ,petrol might actually be cheaper than Diesel if you take everything into consideration .