You might have a roommate or family member on your policy that no longer drives your vehicles. Or maybe you have a vehicle on your policy that is no longer being driven. Making sure driver and vehicle information is up to date may save you money. Keep in mind, if you do go down to just one car on your policy, you will lose the multi-vehicle discount.
I am glad to see USAA at the bottom; but it should not be on the list at all. I am currently going through a claim with them (total loss, I got rear ended, pushed into the car in front of me and they hit the car in front of them; not at fault). I have all correspondence recorded and proof of them lying to me, and using made up regulations to justify it. When asked for the reference for said regulations, I am ignored. I have been throwing WAC at them, quote after quote as to how they are being unruly. This was in December, it is now April and they have YET to give me a valuation report in compliance with WAC. I will be more than happy to provide a copy of our correspondence (with PII edited, obviously), proving how bad USAA is at customer service and how willing they are to break the rules if it benefits them. Email me if you want to see it. I finally had enough and contacted the Washington State Insurance Commissioner; USAA has until the middle of this month to respond to them… We will see what happens next.
Collision coverage has a deductible, which is the amount you pay before your coverage helps pay for your claim. You can typically choose the amount of your deductible when you buy coverage. So, if you choose a $1,000 deductible and your car is later damaged in a covered accident, you'd have to pay $1,000 toward repair costs. Your collision coverage would help pay the rest, up to your coverage limit.