A couple people around here use the composite plastic, which isn't as flexible as regular plastic so it doesn't flop around on the highway but is flexible enough to get out of driveways. Side skirts are a little difficult with lawn edging because it always wants to curl up while you want your skirts to be straight.
The thing about auto transmissions with TC is that you need to be up to speed before it will allow it to lock up. In the automatic, 5th gear is cruising gear, not an accelerating gear, so of course it will downshift when you lay down the gas, but once you are up to the desired speed and the TC locks up, you will get pretty amazing gas mileage. So if you want to get the TC to work with you, you need to have a lighter load once you are up to speed, or else it won't work.
Remember, 80% load for accelerating, <20% for cruising. In my Civic, 80% would be about 3k RPMs while accelerating or 3.0 Gph. Anything past that would be out of the max torque powerband and slower than that would be too slow to get up to speed before the next light. Your car will be a little bit different since it is a little older and a completely different brand, try to look up the BSFC chart for your car to see where and how to accelerate.
Hope this helps!
