Dating back to 2005, the compact Frontier pickup truck shares a platform with the discontinued Xterra SUV and the outgoing larger Titan pickup. In our tests we found the Frontier to be quick and relatively nimble, with a stiff though tolerable ride. The strong 4.0-liter V6 revved smoothly and felt very strong, but fuel economy was a decidedly unimpressive 15 mpg overall. A 2.5-liter, four-cylinder engine powers base models. Only crew- and extended-cab body styles are offered, but rear-seat room is tight even in the crew cab. A model with a longer pickup bed is available, but the tailgate is very heavy. Reliability has dropped to below average. A redesign is in the pipeline.