depends, if u dont need a bigger boot, fit hybrid will give u a very good mileage as insight,civic n fit all share the same IMA, drive train and engine. now here the power to weight ratio will come in to play. IMA in these cars above model 2009 give 13 hp n above 100 NM torque at 1500 rpm, means u get instant push frm the electric motor. therefore in mileage podium its prius aqua-prius-fit-insight-civic respectively.