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The cost of a big truck diesel engine is a greater cost because of the displacement of the engine. A diesel engine is a different design that a gas driven engine. I could go into a long, long explanation of this, cause I'm a mechanical engineer, but I'll spare the engineering lingo. Basically, it depends upon what type of engine you're going to be comparing. If its a small car and a 4X4 truck, then yeah, youre going to have a lot worse gas mileage. Mostly, diesel engines in large trucks produce a higher torque output due to the the higher compression ratio of the engine (diesel's dont use spark plugs, they need to). Disadvantages are that depending upon where you're operating the engine, ie cold weather. Also, gas prices are depending upon the area you live in.
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