The 2015 BMW M4 is the high-performance variant of the 4 Series coupe and convertible. It is powered by a twin-turbocharged 3.0-liter I-6 with 425 hp and 406 lb-ft of torque that’s paired with a six-speed manual or a seven-speed dual-clutch automatic transmission. Fuel economy is decent for a performance-oriented vehicle at 17/26 mpg city/highway with the manual and 17/24 mpg with the automatic.