What eats gas and is unreliable? Imports or Muscle Cars? It would have to be Muscle Cars, though depends on what Muscle Car. The new Camaros, Firebirds, and Mustangs actually get decent gas mileage compared to their '64-'74 counterparts. However they are actually ****tier since they are more complicated and Ford and GM sometimes skip quality for a cheaper price. The older ones are very simple and actually reliable as you can find '55 Chevys still cruising around today, sure they have probably been rebuilt 5 times but for something that old what do you expect.

For gas mileage and reliabilty though Import is the way to slow, oops I mean go.