On days 56, 57, and 58, I used the F687/S for the Beginner/Race of Turbo Sports.  I was awarded a Silver Metallic MIRA TR-XX AVANZATO R(J), and got 4500 total for winning the 3 races.  The F687/S ended 1447.7 mi and 914 hp.
On days 59, 60, and 61, I used the Viper GTSR Concept for the Professional/Race of NA Sports.  Still unmodified, I won without much incident and the only thing worth mentioning was that I didn't feel the need to pit for the 10 laps @ Seattle Circuit (the Viper comes with Medium racing tires).  I got the Zonda C12S, and 60000 for winning the 3 races.  The Viper GTSR Concept ended with 172.7 mi and 498 hp.
On day 62, 63, and 64, I used the IMPREZA Rally Car Prototype for the Rally/Rally of Alps II.  On my previous attempt at the "perfect" game, I gave the IMPREZA the Stage 3 turbo kit and an oil change, and won by less than 2 seconds vs the CELICA Rally Car.  I tried again, but with the IMPREZA as-given, and knew I had to spend some money here.  I decided to give it the Stage 3 turbo kit, but went without the oil change.
During the 7 lap race, I would stretch a lead as wide as 4+ seconds, but would bang into walls here and there and have the CELICA close in.  In fact, on lap 6 I spun out, lost the lead, and fell behind by nearly 6 seconds.  It wasn't until late on the 7th lap that I regained the lead.  I think that with practice, I might have been able to get by with a Stage 2 turbo kit, but I wasn't sure I'd be needing more power later.  I figured, what the hell, spending the fewest Cr is the lowest of my priorities.  I was awarded the LANCER Evolution VII Rally Car Prototype and 35000 for the 3 wins.  The IMPREZA ended with 29.2 mi and 532 hp.
For days 65, 66, and 67, I decided to work on getting the VITZ RS 1.5(J) from the Beginner/FF Challenge.  For my first "perfect" game, I used the Xsara Rally Car to get the VITZ.  But, since discovering that the use of the Xsara is not needed, I had to take a different path.  So the only ways to get a VITZ is to win one from the Amateur/ALTEZZA Race, or from the Beginner/FF Challenge.  Using the ALTEZZA to get a VITZ would mean giving up the chance to get the Tom's X540 Chaser (an unpurchasable car), so I had to use an FF car that was already scheduled to race.  The only other one I could think of at the time was the MIRA TR-XX AVANZATO R(J).  So, I did some testing and BARELY beat out the Lupo Cup Car by adding a Turbo Kit/Stage 1, a Racing Intercooler, and an oil change..  7250 spent.
But I had forgot one of my opponents was the New Beetle 2.0, and didn't check the New Beetle Cup Car's drivetrain.  The Cup Car would've won a lot more easily, and while I'll be using the MIRA anyway, I think I could've saved money (2500) by not buying the intercooler.  Regardless, I won 4500 and the Oinkmobile (pink VITZ) for the 3 races.  The MIRA ended with 14.5 miles and 106 hp.
Day 68 was the Professional/Clio Trophy.  I used the Clio Sport Race Car as-given, and won easily over the non-race Clios (although I couldn't lap anyone).  I was awarded 135000 and the black #23 New Beetle Cup Car.
For days 69, 70, and 71, I used the VITZ RS 1.5(J) for the Professional/FF Challenge.  I juiced this baby to the hilt and spent 119450 on it: Full Custom Suspension; Sports Brakes; Brake Balance Controller; Racing Air Cleaner & Muffler; Port Polish; Full-engine Balancing; Racing Chip; Triple Plate Clutch; Racing Flywheel; Full-Racing Suspension; Stage 2 Turbo Kit; Super-Slick Racing Tires; and Stage 3 Lightweight... no oil change.  
I ran against the Spoon Civic Type-R(J) for 2 of the 3 races, and won too easily.  I'm thinking I may have been able to save some money, but I also remember from the first game needing to max it out for the VITZ races.  Anyway, I got 30000 and the Spoon Civic Type-R(J) for the 3 wins.
So here I am..  With the prize cars I've won, I'll only be needing to buy the Tuscan Speed 6, and a Mercedes (the SLK 230 Kompressor) to complete 100%.  Next up, I'll be going for as many unpurchasable cars as possible.  I plan on running through the remaining 7 endurance races, starting with the longest of them all..  The Tokyo Route 246 Endurance.  I'll be trying for the RX-7 LM Race Car...
Day 72, here are my #'s:
Cr: 1589750
Complete: 20.2%
Prize Total: 1744500
Wins: 53  |  Races: 53  |  Win Ratio: 100% 
Licenses Acquired: S,R (48,0,0) 
Cars Owned: 19
Total Mileage: 1407.4 miles
Total Car Value: 6064100
Bonus Cars Acquired: 19
Trophies Acquired: 58
Cars With Mileage:
F687/S: 1447.7 mi, 914 hp
Viper GTSR Concept: 172.7 mi, 498 hp
Clio Sport Race Car: 136.6 mi, 293 hp
VITZ RS 1.5(J): 67.4 mi, 280 hp
IMPREZA Rally Car prototype: 29.2 mi, 523 hp
MIRA TR-XX AVANZATO R(J): 14.5 mi, 106 hp
Cars Without Mileage:
Spoon Civic Type-R(J)
New Beetle Cup Car
LANCER Evolution VII Rally Car Prototype
Zonda C12S
SKYLINE GT-R Vspec II(R32,J)
Elise 190
TT 1.8T quattro
ALTEZZA LM Race Car
F090/S
Vanquish
Nissan Z Concept
Mazda RX-8
Mazda MX-5 Miata LS
Approx 68 hrs, 30 mins spent since 8/24/02.
Have a great drive everyone!
Hazzard