19th Feb 14 Hi Stuart Just to let you know I was able to get the unit installed and it was very well presented with clear instructions The overall performance and especially the acceleration of the 520 is definitely a lot better and the full consumption was not the bad I finished off at 40mpg on a 160 Mile trip at 80mph-100mph speeds (were sure he meant kmh and not mph) We didn’t adjust the unit at all so if you have any suggestions or tips these would be greatly appreciated Regards Andrew