1956 Cadillac Series 62 Sedan at Klairmont Kollections in Chicago.

This was the first year that Cadillac produced the pillarless sedans.  It featured a 365 cu in (6.0 liter) V8 engine producing a much needed 263 horsepower (196 kW) and 378 lb-ft (513 Nm) of torque to push all of that Detroit chrome and steel to 60 miles-per-hour (97 km/hr) in around 12 seconds according to Popular Mechanics.  This was very impressive at the time.  As expected, fuel consumption was 10.6 miles-per-U.S. gallon (22.19 L/100km).