We also bought the along I75 book, and it is great - lots of neat trivia! For the most part it is pretty consistant at 120-130, with pockets of slower speeds, but then pockets where they are flying by you if you are driving 120 (Atlanta

- and for some reason I am always the driver thru there

). We usually try to pick a fairly speedy car from the state to follow, and if it slows up, we do the same

We even had one guy wave us back as we pulled out to pass him, and sure enough a cop right up the road. In terms of drive time, we are a bit closer to the border (well, right on it actually, in Sarnia) but we made it down to Adele GA last summer in one day. We were aiming for the FLA border, but just couldn't do it......We left here about 5:00 a.m., and finally stopped about 10:00 pm in the midst of torrential rain that we had been in since dinner. If it wasn't for the rain, I think we may have made our goal. I loved the long first day - short second day - we were at the resort just after lunch, which was great, since the kids were about ready to pass out from excitement, there is NO WAY we could have coped with an entire day of that! Anyway, even factoring in your drive from Toronto, I think you would have no problem! Have a great trip!!