According to InterRegs, China recently has implemented a new standard, GB 20997-2007, which specifies mandatory fuel-consumption limits for both goods vehicles and buses with a GVW not exceeding 3500 kg. Separate fuel-consumption limits are specified dependent on variables such as fuel type (gasoline or diesel), vehicle curb weight, and engine size, with additional allowances being permitted for four-wheel-drive vehicles and vehicles equipped with an automatic transmission. For each category of vehicle, the standard contains first-phase fuel-consumption limits and more stringent second-phase limits. All new types of vehicle must comply with the second-phase limits from February 1, 2008. Existing vehicle types must comply with the first-phase limits from January 1, 2009, and with the second-phase limits from January 1, 2011.