What has been your smartest investment?

I traded my sport-utility vehicle for a small, fuel-efficient car. I'll save up to $2,600 during the next five years on fuel and car insurance. On top of that, my new car cost $5,000 less than the SUV and gets around 50 miles to the gallon. I'll be rewarding myself with a king-size bed.

This tip comes from Real Simple reader JENNI BLOOD, Garfield, Arkansas