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This one is straight forward and fairly simple to answer. For identical cars with the exception of one running a turbo, when cruising at some set speed over the same conditions, the non-turbo car will return better fuel efficiency.
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This can be seen if the throttle position is considered. There will always be more throttling/pumping losses with the turbo vehicle since the throttle needs to be more restrictive. The non-turbo engine gets to operate with less throttling to make the same power.
The non-turbo also has less back pressure and also weigh slightly less, though that is a very minor effect.
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If the non-turbo car is optimized with a higher compression ratio, it will get even better fuel economy.
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