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You could put a restrictor plate in the air box, more or less blocking it off with a plate that has a hole in it that only lets a given amount of air pass, but that will only limit performance and not improve mileage other then preventing you from going as fast, however you could instead redesign the air box and air intake to be all around smaller and you should see an improvement if it was the right length as well, to get the math right you are going to need to read up on air intake design or find a calculator that helps you design air intakes but just randomly reducing the size will not help unless you are really lucky, same goes for exhaust size.
Personally I would go for something like the Honda CBR125, I've read a bit about them because I have one of the old CB125 motorcycles that is really impressive and with the CBR125 they improved the gas mileage and top speed and for someone who is used to mopeds it's going to be easy to handle.
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