I have a 2002 Citroen Picasso 2.0 HDI & tow an Adria 5 Berth Caravan (approx 1200kg with luggage). I have recently had the ECU re-mapped by Shires Performance tuning & it has changed the car, approx 15% more power & torque & better fuel economy. Solo motorway 50 - 60 mpg (70 to 80 mph), towing...