You referred to the Acura Warranty as 5 years. However you then indicate that it would only add 4 years to your existing warranty? You also mention that this is a bumper to bumper. I assume zero out of pocket for any repairs? While the current powertrain warranty takes you to 2023, this new warranty extends that out to 2025. The difference is that everything including the powertrain would be covered. So you are getting bumper to bumper including the powertrain for two additional years. What could go wrong beyond the powertrain that would cost a lot of money? The electronics, Steering system, air conditioning, power windows, etcetera. Perhaps these items would not exceed the $5330 that you would need to pay. As you mentioned the hybrid system has its own warranty. That is where there is a lot of cost. The hybrid system probably does not cover the engine? Bottom line is generally buying an extended warranty is really a peace of mind rather than a money saver. It might also help if you decided to sell the car to a private buyer to offer an extended warranty. My belief is that the heart of the system is in the powertrain and hybrid system. If the warranty were more like $3500 it might be interesting? Perhaps other dealers will offer the extended warranty for a bit less money?