Fully investigate a policy's deductible before signing on the dotted line. Consider not only its amount, but also whether it's per visit or per repair. With a per visit deductible, each visit to the shop will run you a fixed amount, regardless of how many parts are repaired; a per repair deductible applies to each serviced part. What sounds like a minor difference could have a major impact on your wallet. If, for example, you've got a $100 per-repair deductible and you take your car in to get the air conditioner, fuel pump and alternator serviced, you'll be out $300; had you opted for a per visit deductible, those repairs would only have cost you $100. Remember that you can also sometimes choose the level of deductible in your coverage contract. The higher the deductible, the lower the cost of your extended warranty.