Here's the math -- it involves the buddy system and sharing rides. If you share your trip to work or soccer or the store and split the bill, it's like paying $2 for gas instead of $4.
Fuel economists say that if you put a third person in the car, the price per gallon drops to $1.33. With four people in the car it drops to a dollar a gallon. Of course, that's if you've a big enough car for everyone and those riding are paying guests.
photo credit: Tim McCaig / Istock