if everybody would be hypermilers then they could be all tailgating - therefore forming a big wind-corridor. No need to pulse and glide when you can tailgate. You probably can get better/similar average fuel consumption when tailgating at 100kmh than P&G'ing 80-100-80 km/h
At least I choose to tailgate bus/truck at 100km/h and I get better-similar FE if weather allows it (no rain/mist or other bad visibility)
YKYAEM... if you read and post into this thread
Meelis