There's a fundamental question here... WHY would someone be tailgating you, if you're driving properly and aren't going too slowly in the fast lane, or something? If it's a one-lane road, just let them pass. I don't understand people who get all the way over on the left, and then slow down, and force all the faster traffic to change lanes to pass repeatedly. In 90% of freeway shootings in Los Angeles, it started with somebody turtling along at or below the speed limit in the left lane, and f**king with people who want to go faster. I know how angry that makes me.
Don't EVER tap the brakes at a tailgater. Most likely, they're already anxious and angry, and most likely if they're tailgating, they already have a bad driving record and don't care if they crash into you and get yet another accident on record. Just pull over into the next lane and let them by, or motion them to pass asap and LET THEM when they go for it. I don't know if my attitude on this comes with age and experience, of if I'm just more secure with my manhood... I just don't need to be the boss on the highway.
The law in California clearly states "SLOWER TRAFFIC KEEP RIGHT", no matter if the speed limit is 75 and you're already going 90... If somebody wants to go 110, you must by law pull over in the next lane to the right. That law is what they call "several" or standing apart from other laws. It has nothing to do with the speed limit. Some people don't know that, and it's not very well-published. In Texas, the left lane of a multi-lane road is for PASSING ONLY; not for driving in.
Charles