An average sedan is just under 73 inches wide not including side-view mirrors. Side-view mirrors add up to 10 inches to the overall width. For example, a 2015 Ford Fusion measures 75.2 inches wide with the side mirrors folded and 83.5 inches with them open.
Newer sedans tend to be wider than older models. A 2014 Toyota Camry measures 71.7 inches wide, while its 2001 model measures 70.1 inches wide. A 2014 Honda Accord measures 72.8 inches wide, and its 2001 model is 70.3 inches wide. A 2014 Cadillac XTS sedan measures 72.91 inches wide while the 2001 Seville model is 75 inches wide.