New Survey Shows Lower Cost of Ownership for Diesel Vehicles
July 1, 2013 8:03 AM
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Study claims diesel vehicles are cheaper to own
A new survey has been published looking at the cost of ownership for gasoline vehicles compared to diesel vehicles. The University of Michigan conducted the study for Robert Bosch, LLC.
The study determined that diesel vehicles save owners between $2,000 to $6,000 in total ownership costs during a 3- to 5-year period compared to similar gasoline vehicles. The data was compiled by the University of Michigan Transportation Research Institute.
"Overall, the results of our analyses show that diesel vehicles provide owners with a TCO (total cost of ownership) that is less than that of the gas versions of the same vehicles," according to the study. "The estimates of savings for three and five years of ownership vary from a low of $67 in three years to a high of $15,619 in five years.”
2014 Volkswagen Golf Variant (aka Jetta Sportwagen for the U.S. market)
The study claims that Volkswagen Jetta owners saved $3,128 while Volkswagen Golf owners saved an estimated $5,013 compared to owners of similar gasoline-powered vehicles. The study also finds that all of the diesel vehicles had better miles per gallon figures then gasoline versions with diesel is offering between 8% and 44% higher fuel economy.
The study also shows that nine of the 10 diesel vehicles held their value better the comparable gasoline vehicles.
One has to keep in mind, however, that Bosch has quite a big financial stake in these results as it produces high-pressure fuel pumps for diesel manufactures like Volkswagen which
have a tendency for failing in late model vehicles
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RE: impressive study even being sponsored by bosch
7/2/2013 10:21:12 AM
So the thing about the diesel particular filters is that a lot of people don't understand how they work. When the computer detects that the DPF is getting "full", the engine sprays diesel fuel into the engine exhaust directly before the exhaust enters the DPF. When it contacts the exhaust gasses, it ignites, reaching temps in excess of 1500 degrees Fahrenheit. This causes the particulates trapped in the filter to be burned off. However, since this system relies on the exhaust gasses to ignite the fuel it can only activate once the engine reaches are certain operating temperature. If the engine rarely (or never) gets up to peak temperature then the DPF recharge can't happen and the DPF will eventually fail. This is more common in a city driving scenario where the car is used for a lot of short drives, or a lot of low-speed stop-and-go situations.
BTW, some cars use a blue urea injection system in place of the DPF/recharge system (VW has AddBlue, Mercedes has BlueTec, etc), but those tend to be larger and more expensive cars (Passat or E-Class), and as such aren't used so much as "city cars" in Europe.
RE: impressive study even being sponsored by bosch
7/3/2013 11:48:31 AM
It's not in place of, but in addition to. Urea mainly deals with nitrous oxide emissions. It does improve fuel economy in a DPF system by requiring less fuel to be used. This is why the Passat TDI gets better mileage than the Jetta, Golf, and Golf Wagon.
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