100% complete. Finished it up by winning the Roadster Endurance race. Being the last race, I actually won four cars:
1. Miata, for winning the race
2. Formula car for completing all of the endurance races
3. Formula car for completing all of simulation mode
4. Formula car for finishing 100% of the game
I think I'll put that game away for a while, I'm kinda tired of it now. 
This will be my first semester with a GPA greater than 3.0 in a while, so that's good. Aside from a couple short vacations, it's nothing but work from now until late August. Hopefully I'll have enough saved at the end of the summer to buy some cool stuff.
My GT3 completion % is slowing making its way towards 100. In the last update I forgot that the arcade mode time trials counted towards completion, so I went back and did most of those. All I have left there is the first rally stage and the complex string. I finally completed all of the professional races, so now all that's left is the endurance races, and they shouldn't be as tough as the TT's, just more time consuming (~12hrs for the remaining enduros). 98.2%, I'm almost there.
Played golf again last weekend, shot a 79. Still need to get the golf program finished. Started playing GT3 again too - I'm sitting at 96.3% complete right now. Seven more endurance races, 3 more Formula GT races, and 2 races for the series where only "normal" cars are allowed. Then I'm done.