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By the way I'll say that if you have output controlled by valve timing rather than a throttle plate, a turbo has the potential to have a greater efficiency benefit because spooling it at part load would constitute an efficiency increase, not decrease. However most cars don't have this so we can't say this in general. In the future as valvetrains get better the turbo will actually be useful as a efficiency improvement add-on, as they are on the Mini (you could argue the BMW N55 engine counts too).
Turbo has quite a bit of potential for efficiency improvement, it just isn't really realized in today's cars. I described this a lot of pages back.
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