One of the biggest complaints drivers have about their cars is poor fuel economy, or more specifically that the car uses a lot more petrol or diesel than the manufacturer advertises. We explore why drivers can't match laboratory fuel consumption figures.
What is the difference between a diesel engine and a petrol engine? As a fuel substance, diesel is denser, slower to evaporate and easier to refine than petrol. These qualities make it cheaper, and more efficient in terms of mileage, than petrol. While petrol and diesel engines work in mostly the same way, the methods behind them differ.