Is it better to use diesel or gasoline for buses? A bus? Diesel is in the majority because it is cheaper to burn diesel. Advantages of diesel engine: low speed torque and maximum torque are much higher than gasoline engine, fuel efficiency is high, and diesel price is cheaper than gasoline: engine vibration, noise, low temperature starting performance is poor, generally need cold start auxiliary device, high maintenance cost, heavy weight, relatively heavy. So diesel engines are mostly used in buses and trucks!