Actually, the Prius has a full gasoline drive train, but it works in concert with the electric system to maximize fuel economy.
The Prius is also available as the Prius Prime, a "plug-in hybrid" which has a much larger battery, and can go about 29 miles on electricity, before switching to gasoline. Others in that class include the Chevy Volt, the Ford Fusion Energi, the Kia Niro PHEV, and the Hyundai Ioniq PHEV. We have the Kia Niro PHEV, and about half of our driving is electric, but we never have to worry when we have a longer trip to make.
The vehicle with a small gasoline engine that generates electricity is the BMW I3.
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