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Some do a little due to maybe increased high pressure pump pressures on worn injectors giving a slightly cleaner spray pattern?
Other half the numbers on the dash look better as more is injected in reality then the ecu thinks us being injected (certainly for older diesel when larger nozzles are fitted. Mine says it does 60 to 65 mpg. Reality is 48 to 52 which is still sweet really for what it does.
BrickMan
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...