Not sure if is a repost, or if anyone else has noticed it. But it appears as if in Sota the guild perk for mounts may be interfering with vehicles.
I used to be able to run and keep up with them. Now they fly by me at a mount type speed.
So i guess in short, if you guild has the mount perk, make sure your driving the demolishers. I finished sota in less than a minute with a partner and no enemies could even keep up with us, we just blew right by them.
Hope my first contribution was semi-helpful.