I've driven about a decent amount in the past few years, including a race to get from CA back to PA in two days so I was in time for Uni, so I have a couple of thoughts for you if you are concerned about freeway time.
1. - Stay in the correct lane. The great thing about freeway driving is that you can drive pretty much any speed you want to (slow or fast) and no one will get pissed at you as long as you are in the correct lane. I had an 8 hour stint at 55mph on my way back home from NY state in order to reduce fuel costs (my V8 only uses 4 cylinders during freeway driving at reasonable speeds), and even though the speed limit was 60mph not a single person rode my bumper or honked their horn at me the whole time because I was in the right-most lane. They all just went around. Did the whole trip on a single tank of fuel.
2. - Stay away from barriers. The worst things ever on the freeway are the 4ft. tall concrete barriers. Driving next to those at 55mph+ totally sucks, no matter how good/calm a driver you are. Move into a different lane to stay away from them.
3. - Don't be afraid to pull off to the side. Sometimes in really, REALLY heavy rain, it becomes almost impossible to see out of the windshield. Do not be afraid to pull over, put your hazard lights on, and wait it out. I have seen way too many people just refuse to stop and navigate using only the blurry lights from other cars at 55mph+. That's how horrible accidents happen.
4. - Log some hours in a driving sim with all the settings put at "realistic." This sounds really retarded, but it works. I recently started playing Gran Turismo 5, and from my time spent playing the game in first person view with all the assists turned off, it has definitely improved my driving. You learn how a car behaves in situations you don't usually come across in real life, so it helps you to anticipate in case the worst should happen. It also teaches good driving techniques in general (how to reliably take corners, the effect of hard braking on handling, etc.) I think a 2003 Honda Civic is actually available as a drivable car in GT5
Hope that helps!