I honestly don't know much about tires so any suggestions would be appreciated. Do I really need all seasons if I only drive in Florida?
Thank you,
Ron
All seasons will generally last you longer than summers. It all depends on the kind of driving you do & what you want to get out of your IS. If you not a huge enthusiast, I personally would suggest a high performance all season or ultra high performance all season personally. That's a pretty decent balance of handling, wet weather performance with pretty good overall treadlife.
Here is a link with some detailed info...
http://www.tirerack.com/tires/types/tiretype.jsp
What size(s) do you need?
It came with 18" 225/40R18 Summer Tires