Toyota has just unveiled the 2016 Prius. This hybrid car is by far the most popular in its segment, and the most recent changes aim to keep it at the forefront. The new Prius is longer, wider and lower than before—and it's also less fuel-hungry thanks to a new gas engine that’s expected to use 40% less fuel. The 2016 Prius rests on a new platform dubbed the Toyota New Global Architecture (TNGA).