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The aim of this study is to describe the impact in CO2 emissions and fuel economy when converting an existing Heavy Duty Diesel engine for On-highway truck applications to a Dual fuel engine (Diesel + Natural Gas) specially in transient operation. A Dual fuel engine with Homogeneous Gas Charge injection in the admission line before turbocharger is considered. The results showed the feasibility of this kind of technology for transient operation reaching a significant reduction of CO2 emissions plus an increment of total fuel economy at expense of a small detriment of engine efficiency and unburned methane in the exhaust gases