What is more fuel-efficient – a diesel or a hybrid?
The answer is not as clear-cut as you would think. Generally, advanced diesel engines may have a fuel-efficiency similar to that of hybrid vehicles. However, a hybrid system can offer better fuel efficiency in stop-and-go traffic while a diesel system is the better performer under highway driving conditions. Some hybrids were designed to offer the performance of a larger engine (the Honda Accord Hybrid, for example) but they still have the fuel efficiency of a smaller engine.
