That's pretty much why they introduced the DRS (Drag Reduction System) in F1. The aerodynamics of the modern cars leaves a hole in the air making it difficult to follow closely. Now, at certain places on each circuit (between 1 and 3 locations depending on the track), if a driver can get within a second of the car in front of them at the detection spot they can open a flap on the rear wing, which gives them a few km/h extra. However, on some tracks a DRS train forms behind a slightly slower car, and as everyone is within a second of the car in front of them, they all get DRS!