How does GT5 combine the two Spec-B experience levels?

Solution 1:

I didn't experiment with Spec-B much, but I believe I got to level 12 or so and I found that your level is much more important than the driver. I had a few drivers (one aggressive, one slightly less aggressive, one more averaged) and I found that the higher level I got, the drivers level mattered much less... My lvl 6 driver was barely any better than my level 2 driver. Even at just level 12. I now want to go experiment with this more now. They ran out of mental energy much less than physical energy I noticed though.