No, this does not mean you need to drop a few pounds (although you might), but you should check to see if you’re carrying excessive weight in your vehicle. The added weight could put a dent in your fuel economy.
For example, my father drives around with his golf clubs in his trunk and therefore takes them everywhere he goes — just in case while visiting me he decides he wants to play nine holes in downtown Chicago in January.
Keep unnecessary weight out of your vehicle. The difference in gas savings may be slight, but over the long run it will pay off at the pump. Let us know what extra baggage you find yourself hauling around for no reason. What’s the strangest piece of dead weight in your car right now?