At 4,823 mm in length and 2,961 mm in wheelbase, the BMW 3 series Gran Limousine sits above the Mercedes-Benz C-Class (4,793 mm length and 2,865 mm wheelbase) and the Audi A6 (4,939 mm length and 2,924 mm wheelbase). For added perspective, the BMW 3 series Gran Limousine is 110 mm longer than the standard 3 series.

from Times of India https://timesofindia.indiatimes.com/auto/cars/bmw-3-series-gran-limousine-330li-320-ld-m-sport-launched-in-india-prices-features-and-more/articleshow/96879136.cms