Just wondering what MPG everyone else is getting on their petrol or diesel RR? I have a 2.5DSE and seem to get: 17-19mpg (mostly B roads) 21-24 (mostly A roads)

Hi this is my first post so go easy on me :) I've had a P38 DSE for about 4 years now. Everyone knows that the standard P38 diesel without a some sort of tuning, wether its a plug in chip or a trip to your local superchips is a bit slow at least on pull away. (to be honest it should come...