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Yes, and no. If you drive right up next to the back of a semi, yes you could use the semi to draft and save fuel, but! And this but, is a big one. Do you want to drive close behind a semi risking your life to save a few cents on fuel? Ever seen a car that has rear ended a semi? I have and it is a horrible sight. Cars don't just hit the back of a semi, they go under the back of semis. At 60 MPH the average vehicle takes from 120-140 feet to stop. At 60 mph, your vehicle is traveling 88 feet every second. If you are traveling close enough to a semi to make use of the draft and save fuel, you are so close that if the semi slams on the brakes, you will almost certainly hit the semi and possible kill yourself and your family, all to save a few dollars. Lets say you are traveling 60 mph and you see the semi brakes. It will take you at a minimum 1/2 second to hit your brakes. You just traveled 44 feet before even applying your brakes. Far too late to avoid hitting the truck if you are following close enough to avail yourself of the draft. You should be 3 seconds behind the truck at any given speed on dry pavement, 5 seconds on wet pavement, and 7 seconds or more on snow. So the question is really a mute issue, because only a fool would do this, to save fuel. And I hope you are not a fool, and want to try this.
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