Finally Maruti has upgraded the petrol version of the Swift and Swift Dzire with the more fuel efficient, refined and environment friendly 1.2 litre K-series engine which comply with BSIV norms. Additionally, these petrol variants will now have a new improved transmission thus enhancing overall power-train performance. The K12 petrol engine on these variants delivers a fuel efficiency of 17.9 km per litre (previous G13B engine delivered 15.9 kmpl). Price of the DZire has been hiked by Rs. 10,000/- whereas the prices of the Swift remain unaltered thanks to small car excise concessions.