Evening, Buying my first diesel car, looking at the same car in a petrol version with the MPG about a half less. Most advise ive been told has been against diesel cars and don't understand as to why when the saving is more than double on fuel compared to a petrol version. (mpg) Diesel:Urban 47.9, Extra Urban 70.6, 60.1 Combined. Petrol:Urban 24.1, Extra Urban 42.2, 33.2 Combined. My daily commute is 19.6 miles with heavy traffic, about £4.73 for a Petrol and £2.25 for diesel. Using Fuel-Economy.co.uk & the MPG urban measurement. I'm right in the sense that fuel savings won't outweigh servicing costs?