oK as of right now you ahve full warranty coverage for 3yrs/36k miles of the original in service date. This covers the entire car except for normal wear and tear. You have powertrain coverag to 5yrs/60k miles. These are warranties provided by Toyota on every new car. The warranty does not expire when the car is traded or anything liek that. IF you were the 10th owner and was still in this time frame it would be covered. With the Toyota Certified warranty they extend the powertrain out to 7yrs/100k miles from original date of purchase. This warranty will coer only the powertrain items included in this link
http://toyota.com/html/tcuv/warranty.html If you ahve any problems with electrical, A/C, door handles radios or anything like that it will not be covered after 3/36.
If you can get jsut a plan that covers the additional items up to 100k miles that is what you would want to do. I used to sell used cars and we offered what was called a wrap policy that covered everything teh powertrain did not. We offered those on cars that had high pwertrain warranties. SInce there is no reason for you to pay for coverage when the amnufacturer is already providing it. if you are worried aobut having problems or jsut want the peace of mind knowing that you will ont have to fork over large amounts of money for possible repairs you should ask if they work with any other warranty companies and can provide coverage through one of those companies. You want to make sure the coverage is waht is termed exclusionary coverag. Basically it willtell you what is not covered. If an item is not listed then it is covered. The company we used at the dealer I worked for was offered by The assurant Group.
I bought an extended warranty on a 94 Cmary for about 800 dollars and have had over 2000 dollars worth of work done to it. I have paid about 250 dollars out of pocket for those repairs. This included the deductible and some misc. items that were not covered but made sense to replace at the same time.
These are jsut some things to think about that I know of since I was inthe business of selling cars and warranties. I have had people come back and thank me for selling them the warranty and I have had others that never used it but if they needed it they had it.