My uncle did that in his car behind a truck when he realised he had little gas and maybe 50+ miles to the next gas station. He used his CB to contact the truck

My uncle did that in his car behind a truck when he realised he had little gas and maybe 50+ miles to the next gas station. He used his CB to contact the truck in front of him, who welcomed him to draft him along. During the trip, both my uncle and the driver heard many other trucks call his truck on the CB To warn there was a car tailgating in the draft. Think he bought the driver lunch when they got to the next town with a gas station.