The ecoDriver project brought together engineers, behavioural scientists and economists to create and test driving support systems to help drivers reduce their CO2 emissions and fuel consumption. The systems enable drivers to receive green driving recommendations and feedback adapted to them and to their vehicle characteristics. A range of driving profiles, powertrains and vehicle types were tested in order to optimise the driver-powertrain-environment feedback loop and to deliver the most appropriate eco-driving advice. The project also had an economic aspect, studying take-up scenarios and scaling up of benefits to the EU level.