The hybrid vehicle 9 wherein said {HEAD ~ 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 
for
The hybrid vehicle 9 wherein said { HEAD ~ 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
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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