Nowadays technology is changing day by day and so as the expectation of the customers. Customers relate their vehicle and their reputation. Smoke coming out of vehicle affects badly on the reputation of the customer that is why today’s customer wants smoke free vehicle during transient condition. Low Air Fuel Ratio leads to smoke due to rich combustion mixture. Smoke could be generated due to turbo leg, sudden acceleration, gear changing, cold condition, altitude etc.During sudden acceleration, turbo leg leads to rich mixture which is favourable condition for smoke generation. It is difficult to reduce turbo leg in waste gate type turbocharger while maintaining EGR requirement in EGR based Engine. Smoke can be optimized by controlling fuelling in sudden acceleration or in transient condition. However it might adversely affect on vehicle pick up and could improve fuel economy.In India, LCV is generally used for FMCG transportation where customer requires to transport goods rapidly in intercity. Low vehicle pickup affects on product positioning in market. In this paper, methodology is demonstrated to optimize smoke and achieve vehicle performance as per customer’s requirement. Fuel economy is the prime focus in commercial vehicles. It is a challenge for OEM to deliver product which meets stringent emission norms like BSIV with EGR and to achieve customer expectations.