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Three light-duty vehicles were measured on-board for their fuel consumption and regulated emissions while driven on diesel, pure rapeseed plant oil (PPO) and a 5% biodiesel (B5) mix with diesel. They were driven along a realistic cycle covering urban, rural and motorway roads. The vehicles were an Opel Vivaro 1.9 DTI Van, a Citroën Berlingo 2.0 HDI car and a Nissan Patrol GR 3.0 diesel SUV. Each vehicle was retrofitted with an Econet PPO two tank kit. They started on diesel when cold and switched to PPO -heated over a heat exchanger- when warm. As PPO has a lower caloric value compared to diesel fuel, consumption on PPO was higher. On B5 no significant effect was noticed. PPO however has lower carbon content and CO₂ emissions were a few percent lower than on diesel except for the Nissan Patrol where they were 8% higher.

Four family cars are evaluated for their fuel consumption and carbon dioxide (CO2) emission: a petrol Peugeot 1.6l 307, diesel Peugeot 1.6l 307, hybrid Toyota Prius II and LPG Seat Leon 1.6l. They are subjected to 4 driving styles: new (environment friendly), relaxed, normal and aggressive. Each driving style is tested on three road types: urban, rural and motorway. Consumption+CO2 is highest on urban roads for all driving styles except for the Toyota Prius where this is only valid for the aggressive style; it is lowest on rural roads except for aggressive driving that is lowest on motorway for the Peugeot 307 petrol and diesel. Aggressive driving results in a significant increase of consumption+CO2 on urban (max. of 68% from the Peugeot petrol car) and rural roads (max. of 47% from the Peugeot diesel car). The lowest increase is for the Seat Leon LPG (9% urban and 19% rural) together with the Prius (18% rural).