Consumer reports has an excellent report at the link, it points out how much wealth is lost by depreciation, but the debt has to be fully paid and serviced.
http://www.consumerreports.org/cro/2012/12/what-that-car-really-costs-to-own/index.htm
Our cost of ownership Ratings comprise six main factors: Depreciation is the largest cost factor by far. On average, it accounts for about 48 percent of total ownership costs over five years. Depreciation is a vehicle's loss in value over a defined period. To calculate it, we start with the price of a typically equipped model and factor in the discounts offered off the manufacturer's suggested retail price on some models. The average model depreciates about 65 percent over five years. Some vehicles depreciate faster than others because of oversupply, limited appeal, or rebates on similar new models. When we don't have depreciation data for a new model, we use estimates based on comparable vehicles. Fuel costs can really add up, especially for SUVs. For example, you could pay more than $15,000 to fill up a Jeep Liberty over five years, while a similar-sized but more-efficient RAV4 V6 could save you $4,000 during that time. To calculate fuel costs, we assume the vehicles are driven 12,000 miles a year, the average reported by respondents to our annual survey. To that we apply the national average price of $4.00 a gallon for regular gas For models that require premium or diesel fuel, we use these costs: $4.20 a gallon for premium, and $4.30 for diesel. On average, fuel is the second-largest cost of vehicle ownership, at 24 percent over five years. Interest is tied directly to vehicle price, and accounts for about 11 percent of five-year ownership costs. We calculate it based on a five-year loan, with a 15 percent down payment, because that is how many people buy cars. We use the average interest rate of 6.0 percent . Insurance costs vary depending on many factors, including your age, location, and driving record. And they can dramatically boost the ownership costs of models that otherwise would seem affordable. For example, if you're looking for a fast car on a budget, steer clear of sports cars such as the Subaru Impreza WRX STi. Insurance can run three times as much as the fun and agile but cheaper to own Mini Cooper S. Overall, insurance makes up about 10 percent of total ownership costs over five years. Costs are derived from data from the Highway Loss Data Institute. Maintenance and repair costs make up 4 percent of ownership costs over five years on average, according to data from Consumer Reports subscribers who responded to the online version of our Annual Car Reliability Survey. They gave us their estimated costs for the past 12 months-excluding tires-and their responses provided data almost 300 models on vehicles up to eight years old. We used estimates based on similar models when data was unavailable. The majority of the costs are covered by the factory warranty during the first few years. But for some vehicles it can still add up. On average, we found that the Porsche Cayenne SUV is the most expensive vehicle to own for maintenance and repairs, costing more than $4,000 over the first five years. But the Toyota Land Cruiser is also luxurious and very capable off-road and costs just over half that. Sales tax costs owners about as much as maintenance and repair does. We use the national average of 5.0 percent. Carrying costs vs. operating costsCosts can be divided into carrying costs (those tied to the vehicle purchase) and operating costs associated with ongoing driving expenses. Operating costs include fuel, insurance, and maintenance and repair costs. Depreciation, interest, and tax are carrying costs. Carrying costs diminish significantly over time, while operating costs rise slightly, primarily due to increasing maintenance and repair costs. Still, on average, operating costs are less than carrying costs until a vehicle is about five years old. Still, we found that some cars are expensive to drive, even though they're affordable to park in your garage. Some small cars, for example, have low prices, but their high insurance costs make them relatively expensive to operate. The Toyota Prius is one of the least-expensive cars to own in our estimation, and most of its costs go into insurance, gas, and maintenance. But small cars are the exception. On average, carrying costs outweighed operating costs by 20 percent over the first five years for the average model we examined. For example, carrying costs for the BMW 750 Li add up to almost $17,000 a year. But it is relatively inexpensive to drive at just over $4,500 a year. Even so, operating costs for some vehicles can be surprisingly high. The Cadillac Escalade, for example, costs about $5,300 a year on average for fuel, insurance, and maintenance and repair for the first 5 years.