With good (newer) tires, you should not ever hydroplane at legal speeds or even higher.How fast can you comfortably go in the rain in this car without feeling hydroplaning? Get Rain-X washer fluid for those heavy rains...
Rain-X isn't that great, fades too quickly. I prefer Aquapel, but I think I'm going to try G1 by Gtechniq, they claim it will last 30,000 miles or so.
Averaged 42.4mpg on the highway today for 40 miles, not bad at all.