I have a dodgy back, and a large dog, and I have to do a high mileage. But I also want to be as green as possible. I therefore want a diesel automatic with a big enough boot to accommodate the dog. At the moment I have a Skoda Octavia that is very good, but I would prefer something a bit smaller as I rarely have more than two people in the car. I did have a Mercedes A class but it was too cramped in the back for the dog.