Is there a toll on Peace bridge? I know it is free to cross Rainbow going to US but there used to be a toll to return to Canada.

Yes its 17.50 USD for a 5 axle truck to cross into the US. 16.50 to cross back into Canada.

Yes

No toll going into the US. Don't remember if there's one into Canada.

Yes. There is.

Yes but I have an E-ZPass and it worked going through. Not sure if the total amount.

28 for tandem trucks don't know for cars yes there is QEW toll when u enter

Yes, prior to crossing its $5