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Increasing public acceptance of power accessories and particulary of factory installed air conditioning units coupled with bigger engines and lower hood lines on the newer automobiles necessitated a reappraisal of the hot fuel handling characteristics of automobiles. Twenty-nine 1956 automobiles, of which nineteen were equipped with factory air conditioning units, representing twelve makes were evaluated for fuel volatility requirements. In 1956 approximately four per cent of all new cars were air conditioned. By 1962 it is expected that about 25 per cent of all new cars will be air conditioned and that one car of every nine on the road will be air conditioned. These figures illustrate the rapid trend to nationwide acceptance of air conditioning in cars of all price ranges rather than the past localized acceptance in high-priced cars. The data obtained in the tests showed that the volatility limits of the cars were reduced on an average of 0.6 lb.