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The 4 Series Gran Coupe M440i offers an optional heads-up display that projects speed, warning and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The IS doesn’t offer a heads-up display.
The power windows standard on both the 4 Series Gran Coupe and the IS have locks to prevent small children from operating them. When the lock on the 4 Series Gran Coupe is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The IS prevents the driver from operating the other windows just as it does the other passengers.
The 4 Series Gran Coupe’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The IS’ cruise control switches are unlit, making them difficult to find at night and operate safely.
The 4 Series Gran Coupe’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The IS’ standard manually variable intermittent wipers have to be constantly adjusted.
Laser headlights, optional on the 4 Series Gran Coupe, produce their light by firing blue lasers through phosphorus, a process that uses one-half the power of the IS’ LED headlights. Laser headlights can have double the range of LEDs with a much smaller surface area.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the BMW 4 Series offers an optional wireless phone charging system (Qi) in the center console. The IS doesn’t offer wireless personal charging.
The 4 Series Gran Coupe M440i’s optional Parking Assistant Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The IS doesn’t offer an automated parking system.
