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Gas turbine engines are cool, and very large scale ones are very efficient. They're great for stationary applications like power plants, and good for ships, trains, and tanks, but there are good reasons we don't see them in small cars.
They're expensive, and you need an airplane mechanic to service them.
It takes time for the turbine to get up to speed or spin down, so the throttle respone would be terrible. The amount of power a car needs varies more quickly than does the output of a turbine.
Small (30HP) turbines might be good as a range extender for an electric car such as the Volt or Aptera 2h. The primary concerns for such power plants would be low weight, small size, good efficiency, and low cost. Gasoline engines take up a lot of space, and turbines might be a solution.
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