The 2015 BMW 420i Gran Coupe is a 5-door, 5-seat hatchback powered by a 2.0-liter 4-cylinder petrol engine, producing 181 bhp. It features rear-wheel drive and either a 6-speed manual or 8-speed automatic transmission. The car is 4638mm long, 1825mm wide, and 1389mm high, with a wheelbase of 2810mm. 

 
Here's a more detailed breakdown:
Engine & Performance:
  • Engine:2.0-liter 4-cylinder petrol.
  • Power:181 bhp.
  • Torque:270 Nm (199 ft-lb).
  • Top Speed:144 mph.
  • 0-60 mph:7.6 seconds.
  • Transmission:6-speed manual or 8-speed automatic.
  • Drive:Rear-wheel drive.
Dimensions & Weight:
  • Length: 4638mm.
  • Width: 1825mm.
  • Height: 1389mm.
  • Wheelbase: 2810mm.
  • Ground Clearance: 130mm.
  • Kerb Weight: 1440kg. 
     
Other Notable Features:
  • Fuel Type: Premium Unleaded Petrol.
  • Fuel Tank Capacity: 60 liters.
  • Fuel Consumption: 6.1L/100km (combined).
  • Body Style: 5-door, 5-seat hatchback.
  • Brakes: Ventilated disc brakes (rear).
  • Suspension: Front: Anti Roll Bar, Coil Spring, Double Wishbone, Gas Damper; Rear: Anti Roll Bar, Coil Spring, Gas Damper, Multi-Link System.