While you're at it, look at what it would cost you to decrease your comprehensive deductible. With Geico, you can play around with different levels of coverage right online. Lowering your comprehensive deductible often will only cost a few bucks. My former roommate (who was an insurance agent) keyed me in on this, and here's how it works:
1. Comprehensive insurance covers things like theft, broken windows, tree limb falls on the car, hail damage, keying, vandalism, chipped window from rocks being thrown up by trucks, etc.
2. Those things listed above are often right on the dividing line of costing the amount of a typical deductible -- say, $500 -- and the company knows this. Take a broken window which might cost $500 to fix: With a $500 deductible you won't make an insurance claim, thereby making your comprehensive insurance useless (but profitable for the company). You might not even make a claim with a $250 deductible knowing that your future rates might go up.
3. Those things listed above are almost always completely out of your control. I have almost 100% control over whether I cause an at-fault accident that damages my own car (collision coverage), and can therefore choose not to carry it because I know the likelihood I'll cause such an accident are extremely low (never had a claim in almost 30 years of driving). But I can't control theft, vandalism, hail, etc.
4. For literally only a few dollars extra, you can lower your comprehensive deductible to $100. Then you won't be shy about making a claim and getting your money's worth if something outside your control happens to your car.