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Keep the intercooler. The above is a good example of improved BSFC (brake specific fuel consumption) with the intercooler.
What's not mentioned is that the more dense air charge (of an intercooled diesel) will also allow more fuel and more power before reaching the smoke limit (under high loads) and the resulting drop in efficiency. Put another way, under normal acceleration, a non intercooled diesel is generally at the fuel/air ratio limit (smoke limit) and a part of that fuel is wasted. That's not the case in a properly turbocharged and intercooled diesel.
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