Have a look at a C-Max, we've got a 2.0litre TDCi which tows our 1420kg Pageant Provence without any effort (and previously the 1195kg Ranger) It tows quite happily in 6th gear at 65mph but you need to change down to 5th for long hills. It returns 30mpg towing, 45mpg solo around town and the country lanes and up to 55mpg on a decent motorway run.