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What is gas mileage like in a 1966 mustang?

The gas mileage of a 1966 Mustang varies according to the engine and transmission combination. The base model Mustang with the 2.8L inline-six engine and a three-speed manual transmission had an EPA-estimated city/highway fuel economy of 17/22 MPG. The GT model with the 4.7L V8 engine and a four-speed manual transmission had an EPA-estimated city/highway fuel economy of 14/18 MPG.