My wife recently purchased a new Vauxhall Corsa 1.3 CDTi (75) ecoFLEX from a main dealer. She does a 130 mile daily commute, only around six miles of which is motorway. We explained the route, use of the vehicle and explained it was to replace a 1.6l diesel car that achieved an average of 55 mpg. Fuel economy is vital. Insurance was important as we need to insure our 17-year-old son. The sales person stated that the Corsa would do significantly better mpg, (around 60mpg even in the conditions described) than our old car and that the insurance would be considerably lower. Neither has proved accurate. Insurance has gone up and my wife has achieved only 43mpg covering the route described. I feel the car has been mis-sold. What are my options?