Your kid is likely broke, unless you've somehow reared a computer genius who has already made a million dollars selling an app she built in her bedroom. But if your kid is more likely to be lounging on her bed merely using apps while she screams at her little brother to get out of her room, she's probably broke. And since you have kids, you probably are too. That's why you want to look for a car that gets at least 20 miles per gallon (8.5 kilometers per liter), which isn't too hard to do in the 21st century, even if you're buying a big, safe car. Oh, and besides the money thing, there's also that bit about there being a habitable Earth for your kid to live on when she grows up. The better the fuel economy of this car, the more likely that is to happen.