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I am a chief engineer working on a tanker. I might say that I now something about engines. There are advantages and disadvantages from both. Diesel engines are more efficient, have higher torque, but are noisier and more heavy. New Diesel engines are very quiet now. About emissions you might be surprised to find out that diesel engines have a significant lower value than a petrol engine. BMW has beautiful 6 cylinders diesel engines, much better in term of fuel efficiency and power than Audi, I don't understand why they do not put them on sale also on North American market. Fuel price is climbing a lot also there, I believe it will be just a question of time when American market will demand diesel engines. However Americans have the advantage of car price in USD ( in Europe is same price in euro), so we are paying 35% more for same car.
My choice will be always a diesel engine.
In case you don't know Audi won 24h Le Mans race with TDI engines late years, for simply reason that diesel engine are more efficient. They stopped less for fueling! I heard things like you will win 0.5 s for 0-100 km/h (0 to 60 mph), but let's be honest, in real life this is absolutely nothing, maybe on a track this meaning something. It is so nice to run 1000 km (625 miles) with a full tank!!!!
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