This is one of the most fun cars on the road for under $30,000 -- and it gets 28 mpg on the highway. There are a lot of standard features packed into that little cockpit, including comfort features such as air conditioning and safety necessities such as front and side airbags. As the car is unchanged from 2010, the 2011 MX-5 will likely earn the EPA's SmartWay fuel-friendly certification, as it did last year.