The 2020 Honda Civic Si is available as a 4-door, 5-seat sedan. Starting at $25,200, the 2020 Honda Civic Si Sedan is powered by a 1.5L, 4-cylinder engine mated to a manual transmission that returns an EPA estimated 26-mpg in the city and 36-mpg on the highway. The top of the line 2020 Honda Civic Si w/Summer Tires Coupe, priced at $25,400, is powered by a 1.5L, 4-cylinder engine mated to a manual transmission that returns an EPA estimated 26-mpg in the city and 36-mpg on the highway.