VTI has on commission of VINNOVA and the Swedish Road Administration (VV) participated in COST 346: "Emissions and fuel consumption from heavy duty vehicles". In this commission VTI has engaged Lund Institute of Technology, Division of Combustion Engines. The research efforts at Lunds Institute of Technology have been executed by Rolf Egnell. This report constitutes a summary of presentations at COST 346 meetings in 2001-2004.