{HEAD ~ The hybrid vehicle} 9 wherein said two ranges for {TAIL ~ the air fuel ratio} are a first range for a stoichiometric ratio of air to fuel and a second range for an air to fuel ratio leaner than said first range 
{ HEAD ~ The hybrid vehicle } 9 wherein said two ranges for { TAIL ~ the air fuel ratio } are a first range for a stoichiometric ratio of air to fuel and a second range for an air to fuel ratio leaner than said first range
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH