I’ve been happy with all the recent efforts by European auto manufacturers to bring fuel-efficient diesels back to the States. From Volkswagen to Mercedes, diesels seem to be the new attempt at pleasing the US “green” crowd with classy, low-emissions fuel-sippers.

Reading that last sentence over, it seems funny to call them a “new attempt” because these high mileage diesels have been available to Europeans for a LONG time — but that’s another story.

So, while it’s debatable whether a gasoline-powered Prius at 40 mpg is more “green” than a diesel-powered Jetta at 40 mpg — it all has to do with how much of each type of fuel comes out of one barrel of oil — It’s a fact that having these new clean diesels as an option is certainly something the US has been lacking for a long time. And I appreciate having that option, I really do.

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“How It’s Made” is one of those head scratchers of a show for me. Take one part horrible muzak and one part kind-of-boring monotone narrator; mix it with some cool behind-the-scenes manufacturing footage of stuff that you normally take for granted; throw in some occasional history and you’ve got yourself… a winner? As much as the show bores my wife to tears, for some reason I love it. It’s so cheesy and cool at the same time.

So I was excited to hear that the show will be doing a segment on the building of an Audi V6 3.0 TDI clean diesel engine. Audi has recently started a push to bring their new clean diesels to the US and market them as a green alternative to gas cars and even electric cars. In fact, Johan de Nysschen, President of Audi America, recently got himself into a bit of hot water by extolling the virtues of diesel while insulting the people who would buy electric drive cars like the Chevy Volt.

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Volkswagen, which introduced its Clean Diesel Technology on the race track in 2008, announced it’s using B5 biodiesel to power its race cars, transport vehicles and generators for the 2009 Jetta TDI Cup season.

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Volkswagen’s launched a new brand: BlueMotionTechnologies.

It houses all of Volkswagen’s best eco-friendly tech. It currently includes a new start-stop system, regenerative braking, SCR catalytic converter and the NO_x storage catalytic converter.

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At the 2009 Detroit Auto Show, Audi announced that their Clean Diesel A3 TDI would be available in US by early 2010.

The Audi A3 is by far one of Europe’s cleanest and most fuel-efficient cars, and Audi is hoping the car will kick some major Prius butt. Pitching the car as a hybrid-fighter, Audi is pairing it off against both the Prius and the Honda Insight.

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A new hyper-efficient 1.6 TDI diesel engine also means that the latest offering boasts fuel economy of 74.3mpg (combined), an improvement of around 20% on the Mark V, while still enabling acceleration from 0-60 mph in 11.2 seconds, apparently due to improved aerodynamics and a new ’sporty’ gearbox.

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According to Businessweek, Ford lists a littany of excuses why they could never market this car in the US. Chief among these excuses is that they don’t think they could ever sell enough of them to make a profit. Ford says that in order to produce them for the US market they’d have to build a new plant and then make at least 350,000 of them a year.

If there’s no way to make a profit on these cars and Americans won’t buy them, why are so many European and Asian car makers bringing these new “clean diesels” to the U.S. starting next year? When I see news that Mercedes, Nissan, Volkswagen and even Honda are all building clean diesel cars with excellent fuel economy for the US market, Ford’s excuses start to seem pretty hollow.

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2009 Jetta TDI Clean Diesel Sedan

VW announced the pricing of the 2009 Jetta and SportWagen yesterday, along with a new fuel economy certification from the third-party certifier AMCI. It seems that VW wasn’t particularly impressed with the EPA’s 29 mpg city / 40 mpg hwy estimation, and wanted a second opinion.

There has been some general confusion circulating about fuel economy estimates for the new Jetta (which will be available in August) ever since VW’s Director of Powertrain Development announced the car could get up to 60 mpg.

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Tiguan HyMotion Fuel Cell Concept Car

Last Thursday I had the opportunity to attend a VW press event showing off the new hydrogen fuel cell powered Tiguan. The vehicle (above) is one of only two concept prototypes in the world, and this one was flown in from Germany for its US debut.

The event was originally intended to be a test-drive of the HyMotion Tiguan, but the vehicle was having “electrical problems” that kept it out for display only. A VW spokesperson assured us that it had nothing to do with the fuel cell, but whatever the problem was they didn’t want it to happen to us in mid-day San Francisco traffic.

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