sorry i miss understood, just buy it, smiles per mile, u only live once mate u can't take it with u, and if u buy at cheap petrol and save like £5.000 think of how much fuel that is to play with, ur diesel will cost u more monthly in payments and ur fuel bill will still be roughly the same. it would take u like 6 years to recuperate the extra cash u spent on buying the diesel car in terms of fuel (just cause of the higher initial cost).