2015 Mazda3 GT: Waiting For The Next MazdaSpeed3 Published on December 29, 2014 in Test Drives by Sylvain Raymond Photo: Sylvain Raymond The Mazda3 GX and GS still feature a 2.0-litre four-cylinder SKYACTIV-G that develops 155 horsepower while the GT has a slightly more powerful four-cylinder with 185 horsepower.