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Message: <blockquote data-quote="SilverBullet" data-source="post: 625436" data-attributes="member: 11244">Acceleration is mainly depending on torque, but once a certain speed is reached that's when horsepower comes into play as well. And horsepower will determine the top speed of the car. So in between it is a combination of both. Diesel cars have higher torque but relatively lower hp (due to the low red line, usually below 5000rpm), and hence it has good acceleration but the top speed is generally lower than a petrol car of similar cubic capacity.For 320d having 0-100km/h at only 7.0s, it has to do with the horse power and torque curve. The 320d runs out of breath at about 3500-4000 rpm, while the petrol engine is still going strong at that range up to 5500rpm. If you look at the graph/chart, the total area below the curve would be reflect this (bigger area). For a daily driver, the 320d is also a good car as most of the time traffic conditions only allows us to drive between 2000-3500 rpm range</blockquote>