I'm interested in purchasing either a brand-new 1.6 petrol Ecoboost Grand C-Max or a nearly new 1.6 diesel Grand C-Max. Both are the same price at £16,500. I can't decide which one to go for. I know that with my annual mileage of 10,000 a year, the petrol model is the recommended engine. However, even though my daily commute is probably too short for DPF regenerations to occur, I do make longer journeys at the weekend. Therefore as I keep my cars for up to 7-8 years, isn't the diesel going to be the cheaper option in the long run?