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by adding an electric motor to a petrol engine. there are 2 types, mild hybrids like the Honda insight, and full hybrids like the Toyota prius
The 2001 Honda Insight has 12 valves.
The 2012 Honda Insight has 8 valves.
The 2005 Honda Insight has 12 valves.
The 2010 Honda Insight has 8 valves.
The 2011 Honda Insight has 8 valves.
The 2014 Honda Insight has 8 valves.
The 2004 Honda Insight has 12 valves.
The 2006 Honda Insight has 12 valves.
The 2013 Honda Insight has 8 valves.
The 2003 Honda Insight has 12 valves.
The 2002 Honda Insight has 12 valves.