开车从美国去多伦多入境是否有记录. Yes. You can answer 3 days in US for the question "How long you have been in US?". They input it in their computer and database. So you must remember and write down what you told them. In case you need.

坐飞机前往肯定有入境记录吗 Yes + you have stamps on your passport.

I94 is available in 6 months. You can reuse it in 6 months. But you must hand in before it expired.

There are a lot city like 大瀑布 on border. Toronto is 130KM far away.

Forn NYC to Toronto is about 9 hours driving