1.1 ,This test method covers the use of automated vapor pressure instruments to determine the total vapor pressure exerted in vacuum by air-containing, volatile, liquid petroleum products and liquid fuels, including automotive spark-ignition fuels with or without oxygenates and with ethanol blends up to 85 ,% (volume fraction) (see Note 1). This test method is suitable for testing samples with boiling points above 0 ,°,C (32 ,°,F) that exert a vapor pressure between 7 ,kPa and 130 ,kPa (1.0 ,psi and 18.6 ,psi) at 37.8 ,°,C (100 ,°,F) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 1 ,mL to 10 ,mL. No account is made for dissolved water in the sample.