Discussion of techniques for making accurate automotive fuel economy measurements using an in-line flow transducer and an electronic display unit. A review is presented of the fuel delivery system of a conventionally carbureted vehicle and describes some of the sources of flow measurement errors this system introduces. Design requirements for automotive fuel flow measurement instrumentation are developed and techniques are presented for making accurate flow measurements in the presence of these error conditions. The descriptive material presented is general in format as each vehicle manufacturer has different design requirements for the fuel delivery system. Testing, however, has shown this information applicable to vehicles from a number of different vehicle manufacturers.