So one of the most popular cars in it's respective segment, the Volkswagon Golf does around 5.7L/100km in the 92TSI Manual specifications.
The Ford Mondeo, a default car for businesspeople since forever, does 8.2L/100km in the Ambiente hatch specification
The Holden Commodore, one of the most popular large cars in Australia does 8.3L/100km in the Evoke 6 speed Auto specification.
You clearly think incorrectly