Cost of owning and operating a Cadillac DeVille (eight-cylinder) for one year

$17,463

Cost of owning and operating a Honda Civic LX (four-cylinder) for one year

$7,561

One-year savings

$9,902

Five-year savings

$49,510

Source: Runzheimer International. Total costs include insurance, depreciation, financing, taxes, licensing, fuel, oil, maintenance and tires.