All of these insurance commercials claim that if you go with them you will save 500 bucks. Here's my thought, why not go to each of them and save that 500 bucks, then in time they should be paying you to buy your insurance from them.
Warshafsky (sp) had/has a catalogue of auto products, and at least 20 items which will improve fuel economy by 10%. If you buy all 20, you should be producing gasoline.