I have been the proud owner of a white, with a hint of blue!'Move up' for the last 20 months, covering 8000 miles and very happy with it. Now I have succumbed to a New Carla Blue 'Move Up' (5 door) with Bluemotion engine. Are there any others out there? Does anyone know if these 'green' engines are 5 or so miles per gallon more economical,as claimed, than the basic engine or is it just a sales pitch? Do they fit low roll resistant tyres as standard?