Generations Model 1 hour 3 Day 2-day Running Years Hot Diurnal Diurnal Losses Soak plus plus g/mi Implementation g/test Hot Hot Soak Soak g/test Pre-control Before 47 1966 (Calif) 1968 (Fed) Initial 1970 6.0 Evaporative 1972 2.0 Emission 1978 6.0 (a/) Controls 1980 2.0 Pre-Enhanced 1995- 2.0 - - - 1998 Enhanced 1996- - 2.0 2.5 0.05 Evaporative and
ORVR 2003 Tier 2 2004- 0.95 1.20 0.05 2009 0.50 0.65 Tier 3 Near- 2017- 0.300 0.300 0.05 Zero Evaporative 2022 Emissions Generations Spitback
ORVR (b/) Useful Technologies g fuel g/gal of fuel Life dispensed Years /Miles Pre-control Initial 5/ Gasoline tank vapor captured in charcoal canister.