The Subaru PZEV or Partial Zero Emission Vehicle engine technology enables Subaru’s Boxer engines to emit significantly less tailpipe emissions while running on regular unleaded gasoline. The movement toward PZEV engines began in 2014 when the U.S. Environmental Protection Agency (EPA) published its Tier 3 Motor Vehicle and Fuel Standards for emissions. The California Air Resources Board (CARB) was the first to coin the Partial Zero Emission Vehicle or PZEV moniker in 1998 to encourage auto and engine manufacturers to implement
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