2016 INFINITI Q50 Hybrid is the newer version with just one noteworthy difference, the fuel economy.. And finally, you get 1.5 more mpg with the 2016 INFINITI Q50 Hybrid than with the 2015 INFINITI Q50 Hybrid. Among similarities are the body structure, powertrain, market segment, starting price, horsepower, ground shadow size, height, and maximum occupancy.