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Because of its British "mini" car size.
The 2002 MINI Cooper has a 1.6 L base engine size.
The 2010 MINI Cooper has a 1.6 L base engine size.
The 2004 MINI Cooper has a 1.6 L base engine size.
The 2013 MINI Cooper has a 1.6 L base engine size.
The 2009 MINI Cooper has a 1.6 L base engine size.
The 2008 MINI Cooper has a 1.6 L base engine size.
The 2007 MINI Cooper has a 1.6 L base engine size.
The 2014 MINI Cooper has a 1.6 L base engine size.
The 2012 MINI Cooper has a 1.6 L base engine size.
The 2003 MINI Cooper has a 1.6 L base engine size.
The 2011 MINI Cooper has a 1.6 L base engine size.