really depends on how you drive whether you floor it or not, but just for everyday normal driving the fuel economy is pretty good. it is def not 12/100km. it more like 7-7.5/100km maybe. anyway you wont go wrong with fuel economy. but i the 8th gen seems to have a few factory problems, one of them is the driver side window stuffing up. however honda will fix it with your warranty. people on hear have listed alot of other problems to which i have not experienced except window problems. if your able to deal with these issues, the civic is a nice car for you.