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