Vespa has developed two scooters that feature hybrid engines to give you even better gas mileage. The LX 50 has a 50cc gas motor and a 1000W electric motor. The Piaggio X8 125 has a 125cc gas motor and a 2500W electric motor. The addition of the electric motor will give a 25-percent boost to fuel efficiency. There is even a nice option to operate completely on the electric motor for Vepsa cruising in places that don't allow combustion fumes.
Vespa Unveils Two Hybrid Scooters [Retro Thing]