When at my original dealership, there is a km cap on the car and returning the fuel level. Another customer went over her km (around 200km for the day) and the SR was giving her a hard time.
So I doubt it.
Maybe ask the dealership if they also deal with a car rental company, like Enterprise, and get their preferred rate. Some rental companies also restrict your unlimited kms within Ontario.
Organized crime is alive and well: It's called auto insurance