I am looking to buy a 2010ish Mondeo probably diesel, I currently run an LPG (75) so you can guess my question, which is the most economical on fuel. I have been looking at 1.8TDCI 125 or even 2.0TDCI DPF 140. Not sure what all the number mean (1.8 & 2.0 I know). I travel to work on the motorway (22 each way) and do about 50miles town driving at weekends (all aprox mileage). which is the better, Ive been told the 2.00ltr are peugoet engines which have a good reputation but know nothing on the 1.8. Can anyone help please.