Clark advocates thrift, but sometimes he'll hear about someone who goes way beyond him when it comes to making a dollar stretch.

A 90-year-old Florida woman named Rachel Veitch has driven the same car -- a Mercury Comet she calls "Chariot" -- since 1964. She bought it for $3,289 back when gas was 39 cents/gallon and it has outlasted 3 of her marriages. The odometer is now closing in on 600,000 miles!

"My Chariot has never lied to me or cheated on me and I can always depend on her," Veitch told FoxNews.com. "My last husband and I divorced in 1975 and he took the 1972 Pontiac we had and I kept Chariot. I'll bet he's traded cars half a dozen times by now and I still have my Chariot, my faithful pal."

Clark is not asking you to keep a car for 45 years. But you've to realize that a car is the second largest expense for most Americans after housing. And the biggest expense with an automobile is depreciation, especially if you like to cycle through new cars every 2 or 3 years.

If that sounds like you, Clark has a suggestion: Try buying a 3-year old car every 3 years. It will be new to you, and you'll let somebody else suffer the depreciation that accompanies a car's first couple of years on the road.