The EPA and diesel fuel mileage - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 05-24-2009, 02:35 AM Thread Starter
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The EPA and diesel fuel mileage

Has anyone seen a study or comparison that proves that the newest generation of diesel engines are truly cleaner than previous models when you factor in additional fuel consumption? Sure my older trucks kick out a little black smoke when pushed or under a load but is the reduction in NOX and particulate really that great when you consider that a newer truck in the same trim level is around 25% less fuel efficient (although a little more powerful).
It's hard to believe that bureacrats and special interests have taken on engineering and we are forced to live with it.
The worst part is all the awesome diesel cars running around europe (and manufactured by our own American companies) getting 40-70mpg and still unavailable here because of the ridiculous high NOX emission standards.

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post #2 of 7 (permalink) Old 05-28-2009, 07:41 PM
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I've always wondered about that. How can engines run cleaner if it takes 5 to 10% more fuel to do the same job?? Seems to me that if you burn more fuel, you put out more so called pollutants.

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post #3 of 7 (permalink) Old 05-30-2009, 04:13 AM
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If a guy had the actual figures to tell what the emissions were on both an older model and the corresponding new model, along with the average fuel mileage for both, you could figure it out..

However, I think you would be surprised at the results... I say that because I seem to remember reading someplace that particulate emissions on an 09 are something like 90% less than they were just a few short years ago... So, even if you use a third more fuel with the new model, you would still probably have a net reduction in emissions... (assuming everything remained stock)

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post #4 of 7 (permalink) Old 06-01-2009, 06:06 PM
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I read a quote from the president of VW that if California had allowed the VW diesel to be sold with europeen standards, in the begining of the century it would have 40% less polution then they had last year. That is if Diesel cars were to replace the Gas model Cars. And I think it was something like a 8% increase in diesel automobiles. I personnaly feel that we in america shy away from diesels because they are idled way to much and the smell of fuel enters the vehicles. I was told that my car did not smell like a diesel. I never Idle it even in the cold because I don't like the smell that enters my vehicles. We American Keep our cars idling way to much, unlike europeens. Until we stop idling our diesel, they will never be popular among the vehicle owners. In Canada VW's are very popular among the french population because we live out of the cities and travel long distance to work. We enjoy the savings in fuel, and these VW last forever, the likes of 400K miles is very common, and the ownership cost is the cheapest. My son has a Corola and I cannot drive 50miles with that car without hurting my back. Cavaliers are the same. My VW seats are 22 years old and are just like new.

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post #5 of 7 (permalink) Old 08-27-2009, 09:00 AM
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I read an article a while ago, I think it was in Popular Mechanics, it was about the new Diesel engines and the emmissions systems on them. The new diesels in big cities are sucking in air that is more dirty and poluted then what is coming out of the tail pipe. So basically the new diesels are an air filter for the cities. Yet they still want them to be cleaner...

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post #6 of 7 (permalink) Old 08-28-2009, 02:29 AM
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post #7 of 7 (permalink) Old 08-28-2009, 03:36 AM
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AMEN keydl. Hit the nail on the head with that one!

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