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With a turbocharger, you could vastly increase low end torque and widen the peak BSFC area to much lower rpms. This would necessitate a different type of tuning system than what is conventionally used on turbocharged engines. The system would aim for peak torque while keeping the engine in closed loop always. This would require a way to dynamically alter boost pressure based on rpm and load (hey, I never said it would be easy). This would allow you to always have optimal cylinder pressures. The only variable left really would be RPM (more specifically piston speed).
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You don't want more low end torque for economy. Most cars can cruise just fine in top gear. If you aim for peak torque, you'll be doing 90mph on most cars before long. Most of us can't take advantage of peak efficiency, because it causes us to cruise at aerodynamically inefficient speeds. A turbo does nothing to solve this problem.