In 1974, an exhaust emission correlation study was conducted between EPA and the Motor Vehicle Manufacturers Association of the United States, Inc. As a result of that test program it was decided that another, but somewhat more limited study, should be conducted in early 1975. This report is a discussion of the 1975 EPA-MVMA correlation program. Test data were collected in January, 1975. The purpose of this study is to compare the results of vehicle exhaust emission and fuel consumption tests at EPA facilities and several American MVMA members. In addition to comparing test results, this study also compares test equipment, procedures and conditions used at each facility. If there are any real differences in emissions and/or fuel consumption measurement, it is hopeful that the analysis of equipment, procedures, and conditions will reveal the cause of these differences.