My 2p worth....based on recent change from diesel to petrol.
less than 6000 miles a year, mostly short distance = petrol, petrol hybrid or electric.
6000 to 18,000 a year, good proportion of long runs = hard to call. New Euro 6 Diesel, but electric a possibility and Petrol not to be ruled out.
18,000 miles a year, a lot of long runs = Euro 6Diesel, but a largish car with room for all the Add Blue kit.
We do about 7000 miles a year and wanted a 4 seater coupe with performance. So we bought the AMG43. Petrol...