Aside from the Grom and the Kawasaki Z125,
there's:
Sym Wolf 150
Suzuki TU250x
K-Pipe 125
There's also a bunch of cheaper Chinese bikes, like Roketa which has customer support in Texas (they ship parts); and TaoTao, and if you like a CVT, there's ZNeN, BMS, Yamaha, Piaggio, and a few more...
You can even install a 22-50cc two stroke motor on a bicycle frame, and get good gas mileage!
All these are excellent for gas mileage; but are pretty limited in speed.
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