I have to get my driver's license renewed soon and I have to take the written test. Since it's been 10 years, I decided to look the test up on the DMV website. Good thing I did. Question: An extra 100 lbs in your vehicle can reduce gas mileage by what percent? WHAT?? What on earth does this have to do with knowing traffic laws? There is a second fuel consumption question that is more of a no brainer, but neither of these questions should be on a driver's license test. Who decides these things?