Probably a stupid question, but here goes: Horsepower always measures the amount of work an engine can perform in one minute and can be converted into watts by horsepower X 746 = engine power in watts, right? I ask this because I was wondering about something. According to http://www.gizmag.com/volvo-premieres-worlds-most-powerful-truck/10724/" has 100 hp. I'm pretty sure this truck is designed to haul a lot more than 2-7 times the weight of those cars (the legal limit for truck hauling in the US is I think 36 tons - 24 times the weight of the Leaf), so it seemed kind of odd that big truck engines would have such relatively low hp if it translated directly to engine output in watts and I was wondering if there was more going on here. According to http://www.howstuffworks.com/question381.htm" big diesel engines usually have long strokes with high torque but few piston cycles per minute while smaller engines tend to have more piston cycles per minute, but I don't think that would matter here (the horsepower is work per minute and even a long stroke engine should have many cycles per minute, so you're just seeing the same energy divided over many vs. fewer cycles). Just wanted to check that I can plug in 700 X 746 = 522 kW for the big truck's engine and this would be an accurate answer. Any problems here? Thanks.