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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.

Source: Autoblog



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RE: impressive study even being sponsored by bosch
By Dribble on 7/1/2013 10:33:56 AM , Rating: 2
...and after those 5 years you sell the car. Which is worth more - the diesel with the engine that has a lot of life in it yet, or the petrol that's going to die much sooner? The diesel that's more economical, or the expensive to run petrol (someone who can only afford to buy a 5 year old car is going to care more about costs then the person who could afford to buy it new)?


RE: impressive study even being sponsored by bosch
By dnd728 on 7/1/2013 11:09:44 AM , Rating: 3
The thing is, in Europe lately diesels started losing market share.
Here are some reasons:
http://www.greencarreports.com/news/1082978_are-di...
quote:
Most smaller European diesels don't currently need urea injection, but new "Euro 6" emissions standards will arrive in September 2014. They're roughly equivalent to U.S. standards that have seen urea injection fitted to every passenger diesel sold in the States except the Volkswagen Golf and Jetta and 2014 Mazda6 diesel.

quote:
At some point, the extra expense of a diesel car simply won't be worth the extra money

quote:
Longer-term maintenance is causing worries too, with those necessary particulate filters often failing for city-bound drivers.

quote:
economical low engine speeds mean exhaust gases don't get hot enough to burn off the particulate matter--leading to clogged filters and expensive replacements.

quote:
Small gas engines improving

quote:
Today, they're starting to disappear, replaced by tiny-capacity, turbocharged gasoline engines like Fiat's TwinAir and the 1.0-liter Ford Ecoboost. Volkswagen has said it will build no future diesel of less than 1.6 liters for its volume cars.

quote:
there's much less difference in gallons of fuel consumed.


By Jeffk464 on 7/1/2013 11:24:48 AM , Rating: 2
I can attest to the particulate filter thing. I used to bread down all the time because of those things. I believe in the concept but they have to make them reliable.


RE: impressive study even being sponsored by bosch
By DerMack on 7/2/2013 6:36:06 AM , Rating: 2
I'm not sure how well known it actually is but the cars are meant to burn up the particles on the filters once the onboard sensors detect high enough pressure drop across the filter. During the burn cycle the engine will run wierdly for some time and most people just panick at this point thinking somethings gone wrong and stop the engine and this really will ruin the filter.. so let it run...


RE: impressive study even being sponsored by bosch
By kmm1191 on 7/2/2013 10:21:12 AM , Rating: 2
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.


By superstition on 7/3/2013 11:48:31 AM , Rating: 2
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.


RE: impressive study even being sponsored by bosch
By Mint on 7/1/2013 2:48:13 PM , Rating: 4
This is exactly the type of thing that makes me skeptical of the study in the article. I mean really, up to $15k over 5 years? It's not like diesels are maintenance free and get 100 MPG while gasoline engines are built like an XBox 360.


By kmm1191 on 7/2/2013 10:22:32 AM , Rating: 2
By my estimates I can hit $7500 in 6 years with a Jetta TDI. I expect that with larger more expensive cars (Mercedes BlueTec, perhaps) you would see even better numbers.


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