The U.S. Environmental Protection Agency receives information about many systems which appear to offer potential for emission reduction or fuel economy improvement compared to conventional engines and vehicles. This evaluation of two Honda Compound Vortex Controlled Combustion (CVCC) vehicles is the third opportunity for the EPA's Emission Control Technology Division to report on the emission and fuel economy performance of vehicles incorporating the stratified charge engine that Honda Motor Company of Japan announced publicly in the Fall of 1972. In September of 1973 EPA requested the loan of a CVCC powered Civic for use in comparison tests between various stratified charge, Diesel, and conventional engined vehicles. In response to this request, two vehicles were provided by Honda for an indefinite period of time. This report covers the first series of in-house evaluations of the vehicles loaned by Honda for the comparison program. Further testing and comparisons with other vehicles will be drawn in future EPA reports.