Mazda modernized the classic roadster concept with the original Miata. Lighter and shorter than the diminutive original, the fourth-generation remains true to the formula. Although 155 hp from the 2.0-liter four doesn't sound impressive, the Miata quickly scoots along while returning a miserly 34 mpg overall. Shifting the delightfully-accurate six-speed manual shifter is a joy; we'd skip the optional automatic, though it works fine. Quick and precise steering delivers sublime backroad handling, but high levels of noise, thin and unsupportive seats, and a stiff ride all grow fatiguing during highway travel. Cabin space is snug, and the optional dial-controlled infotainment system takes time to master. Flipping open the convertible top is a breeze.