This year, Mazda has replaced the base engine in the 3 and added a bigger displacement upgrade that also has a turbocharged option that really changes the game for compact cars.
The base trim is the Mazda3 2.0, which comes in front-wheel drive only and includes a six-speed automatic transmission along with a nice list of standard features like LED headlamps, alloy wheels, an 8.8-inch infotainment display with eight-speaker audio, and remote vehicle monitoring via the Mazda app.
From there, the trims go upwards with the Mazda3 2.5 S, which adds the 2.5-liter engine and Apple CarPlay and Android Auto (mysteriously missing from the base model).
The Mazda3 2.5 Turbo upgrades the S with the turbocharged 2.5, adds all-wheel drive as standard, and ups the wheel size from 16 to 18 inches.