I owned a diesel 2.5 TD5 discovery on an 02 plate, I now have a 4.6 hse P38 RR on a 97 plate. The TD5 returned about 27mpg on a run where the RR returns a max of 21.6 mpg so far. Saying that the RR only does around 9.6 mpg around town, the diesel TD5 did a lot more. The power on the RR is far...