+22 Cars Petrol V Diesel Ideas. This means a diesel engine is generally 20 per cent more efficient than an equivalent petrol engine. Diesel produces more co2 emissions per litre of fuel burnt;
This is because the cost of registration for the diesel car is more than that of the petrol car. However, diesel fuel is denser than petrol and contains about 15% more energy by volume (roughly 36.9 mj/litre compared to 33.7 mj/litre). Volatility of petrol vs diesel.