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It is a grey area, depends on the remap. If the remap is to your engine there can be some difference but the thing is not to look at the BHP as that is just a figure what you want is a smooth fueling graph and a smooth torque graph.
Lots is in the drivers head as has been mentioned by others on this thread when working with commercial stuff and they are always looking at ways of saving money.
lynx
Most remaps seem to result in improved fuel efficiency but tuners don't like to quote it because if you get a remap and then drive like a tit you're unlikely to see the improvement...