I'm not convinced he did lie. If there was only one set of tyre tracks that begs three questions...
1) What happened to the tyre tracks from the music pupil who went to the Rassier house for a lesson that day?
2) Why do Jacob's footprints stop a short way up the drive?
3) If a perp drove a short way into the drive and turned the car, and Kevin also drove a short way into the drive and turned the car, how do we know Kevin's tyre tracks didn't cover the perp's?
We're looking at clipped photographs and dealing with incomplete information, so I don't think we can be absolutely sure that there were only one set of tyre tracks on the drive. On a slightly tangential note, Kevin's story begs another question - he says he spoke to a police officer at the scene that night, so why didn't that officer tell his colleagues straight away that a car had turned in the drive?