Went to my local BMW dealer today to have a quick look at our new 123d M Sport. Amazing how diesel technology has moved on - 2 litres, twin (two stage) turbocharging, 204 bhp, 138 g/km CO2 which puts the car in one of the lowest tax bands here in the UK. 147mph, 0-60 in 6.9 seconds is quicker and faster than a Golf GTi,54mpg more economical than a base Ford Fiesta.