Likewise the driver of a hybrid vehicle towing a trailer may want to insure that {HEAD ~ the drag} exerted on the vehicle does not exceed {TAIL ~ a certain predetermined threshold} or that fuel efficiency is maximized 
Likewise the driver of a hybrid vehicle towing a trailer may want to insure that { HEAD ~ the drag } exerted on the vehicle does not exceed { TAIL ~ a certain predetermined threshold } or that fuel efficiency is maximized
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH