A hybrid vehicle in which {TAIL ~ an engine} can always be driven in a highly efficient region in accordance with {HEAD ~ the required running load} 
A hybrid vehicle in which { TAIL ~ an engine } can always be driven in a highly efficient region in accordance with { HEAD ~ the required running load }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD