but there theory other again. at car race nascar, cars even mutual close to one another because with those nearness is in high-speed, so car exist in hind even get profit from lower air defence coefficient so that more saves. that also said by engineer from jadavpur university where if there a group car with distance 1 meter walk with, so all cars except front has lower air defence coefficient so that can save bbm. so their recommendation is turn on censor in front of car so that can detect when quicker car or tread on brake. but this effort at wind tunnel. so all ideal condition. to at nascar, because they drive at a speed of 200 km/clocks, so matter will whatever that can decrease air defence they will chase. but if only road 50-80 km/clock, will have extravaganter brake gas consequence.
so practically, not the car that be regulated so that uniform well, but behind that wheel, that is the human. we can not predict person character drive. try if we see there convoy car with distance every car 1-2 meter. except that mortal remains motorcade, we certain felt there gap to be able to enter. final permanent also gas brake.
therefore, i am permanent disagree with tag car. may be will koid tailgating this because will squander car and also kampas your brake.