Gas Price. Diesel has always cost more than gasoline because of environmental embargoes and taxation. At a point, diesel costs as much as 76 cents on the gallon more than gasoline. There has been a federal excise duty of 24.4 cents on the gallon for diesel against 18.4 cents for gasoline.. 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). Accounting for the difference in energy density, the overall efficiency of the diesel engine is still some 20% greater than the petrol engine, despite the diesel engine also being heavier.

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Summary. The main difference between diesel and gas engines is in the fuel they use. Gasoline burns faster and produces more horsepower, while diesel is thicker, burns slower, and is more dense. Diesel vehicles burn less carbon dioxide than gasoline vehicles, but they emit potentially toxic particulate matter.. The more cylinders an engine has, however, the more complex and mechanically inefficient the engine becomes. How the cylinders are configured also has a bearing on performance, vibration, and.