I had diesel cars for many years, but with doing less mileage now and the gov making bad noises about diesel cars, i bought a new petrol car around 3 years ago. I used to buy a new car every 3 or 4 years, but i think i'll just keep this car until its no longer financially viable and then give up having a car altogether.
I'm now only doing 2 to 3 thou miles a year in my car.... and i could easily cope with just using my bikes, motorcycles and public transport. The thought of being free from car ownership is quite liberating.