[Purist]

Brent, you're seriously overestimating top-end speeds on the Indy Cars. The highest speed on a non-oval for an Indy Car is presently at the end of the back straight at Sao Paulo, which is just over 0.9 of a mile. The highest speed seen there has been 188-mph, so 190+mph on the shorter, uphill, Mario Andretti Straight at Mosport is NOT going to happen.

As another example, about the fastest we see Indy Cars going on a permanent road course is at the end of the downhill back stretch at Mid Ohio. There, they top out at 173-mph or so. The last, and even the current, generation of Indy Cars are simply draggy as all get-out!

As for Mosport, the 2007-08 LMP2s were flat-out through Turn 2 at ~160-mph, and flat-out through Turn 8 at ~175-mph. If those cars, with similar or slightly less horsepower, and being 120-145kg heavier, could do that, well, I don't think the Indy Cars will have a problem going through those turns with the pedal to the metal. (The Indy Cars are supposed to be 680kg or so in road racing trim, while the LMP2s were 800kg in 2007, and 825kg in 2008.)

Indy Cars at Mosport speed estimates:
1. Entry to Turn 1- 150-mph
2. Exit of Turn 1- 155-mph
3. Entry to Turn 2- 160-mph
4. Apexes of Turn 2- 160-mph
5. Entry to Turn 3- 165-mph
6. Apex of Turn 3- 130-mph
7. Bottom of Turn 4- 175-mph
8. 1st Apex of Turn 5- 65-mph
9. 2nd Apex of Turn 5- 55-mph
10. Top of Andretti Straight- 180-mph
11. Apex of Turn 8- 175-mph
12. Apex of Turn 9- 160-mph
13. Apex of Turn 10- 85-mph

The limit of adhesion and tire scrub keep your speed pretty steady through Turn 2, and cost you a few miles an hour through Turn 8. Turn 9 is partially a braking zone for Turn 10. Turn 3 can be a passing place, but it's tricky within the same class for Sportscars, and the Indy Cars will have an even lower reduction in speed to get through the corner.

To cap things off about Mosport, the Indy Cars would be piling on a fair bit of downforce for Mosport, because of all those high-speed corners. This means they will NOT be optimized, by any means, for ultimate top-end speed.

Just to hammer home the top speed thing, in general, one more time, the highest speed seen at St. Petersburg, just under two weeks ago, was 162-mph on the approach to Turn 1.