Full and complete coverage service plans can also include reimbursement of road or during repair-costs (towing, car rental, etc.).
Never respond to a car salesman with an automatic "yes" to this question.
From a dealer, the service advisor usually recommend a number of maintenance parts you do not need.
Dealers will update the vehicles to make room for new upcoming models and factories usually have their biggest incentives at the time.
This is a good thing because it prevents unnecessary damage to the car is not covered by warranty.
There is a huge rivalry between the organizations offering extended warranties.