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Deisels have a short powerband mostly when they are undersquare for truck applications. Build one with more car-like internal dimesions and you'll get your rev range back to an extent.
Also, semis need 12 gears (or more) for a lot of reasons, and it has more to do with how much weight they're pulling than the powerband of the engine. Most of thier gears are used under 35 mph to serve as torque multipliers to get really heavy loads rolloing. They need to optimize the engine's performance per MPG in order to keep the truck cost effective.
Deisels are a good idea, and I thought the same thing about Camaro's when I first read about this motor a couple months ago.
Also, did you guys notice that this engine has no intake manifold? The incoming air is just piped right into the valve covers. And the exhaust exits in the valley to keep the width down. Neat stuff.
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