http://justacarguy.blogspot.com/2012/06/if-you-want-to-save-money-on-car.html for the posts I've done that show the different amounts that car insurance companies quoted me.
A quote takes about 10 minutes, and they will want a phone number, make one up. An email, make one up. You will need to have insurance as of the time you call for a quote, because you have to tell them what you currently have as coverage limits, and getting a factual comparison isn't going to happen if you are not insured... all insurance companies penalize you for not paying some insurance company. They don't care who gets your money, they insist that you pay for insurance... because if you aren't cuurently paying someone, you are likely to be a bad prospect for paying for a new company to cover you.
So, get a recent insurance coverage bill from your car insurance, and try for the free gas giveaway. It'll take 10 minutes, and won't create email spam or phone calls. Just keep in mind to not give your phone number or email, make one up or give your ex's, or your in laws.