The back straight, the one after the uphill section, I could get the car up to about 122mph. That's because I'm a wuss and am too afraid to floor it up until the moment of braking.
I did an log with an iPhone app called Dynolicious Logbox, and there is some algorithm I can do in excel to convert the positive G forces into miles per hour. Just haven't gotten around to figuring it out.
If I had HPT Pro I could log that way, without a laptop. There's so many other ways to do data acquisition, and as cool as it is, I'm not trying to set lap records here so I will probably not invest much in it.