The 2013 Mazda MX-5 Miata has a rather small four-cylinder engine, and it weighs only about 2,600 pounds in its heaviest form, with the hard top; that considered, you might expect the Miata to top 30 mpg on the highway. But because it's geared more for performance, it's not quite that fuel-efficient.
Models with the five-speed manual transmission score 21/28 mpg city/highway in EPA testing, for 25 mpg combined. The six-speed manuals also score 21/28 mpg, but 24 mpg combined. The six-speed automatic likewise scores 21/28 mpg, but rates 23 mpg combined.
In real-world driving, we've done better, however, with some of our editors' drives managing more than 32 mpg on the highway.
The 2013 MX-5 Miata is greener than many sports cars, although it's not nearly as fuel-efficient as a most small hatchbacks that are otherwise about the same size.