A comparison has been made between the fuel consumption of a typical European passenger vehicle powered by gasoline, Diesel and Stratified Charge Engines having performance characteristics allowing equal vehicle acceleration. The study shows that on the average the gasoline and Diesel fuel consumption are similar, while with the S.C.E. a benefit of from 7-20% was observed. Compliance with the European regulations is the main exhaust emission constraint within the study that has been conducted. But, when available, exhaust emissions data for the U.S.E.P.A. “FTP” cycle have also been quoted.