My usage of car is 10,000 km/per annum (city and outdoor drive equaly). Which fuel engine is economic for my ciaz car?

My usage of car is 10,000 km/per annum (city and outdoor drive equaly). Which fuel engine is economic for my ciaz car?

Question asked from: http://www.carandbike.com/maruti-suzuki-cars/ciaz/shvs-vdi