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 1.5LL , 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 2020HondaCivic Siw/Summer Tires Coupe , priced at $ 25,400 , is powered by a 1.5LL , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 26-mpg in the city and 36-mpg on the highway.