The Honda Insight concept took a hushed bow under the lights of Paris today. It’s Prius-esque, but in person the car is less evocative of its Toyota challenger. The Insight’s width and rather low height give it a substantial presence, and there’s a bit of attitude out back with the hatch sliding into a flick of a tail. We imagine some of the more complex elements, such as the headlights reminiscent of shards from Superman’s home planet of Krypton, will not make it to production. We hope the interior, however, is left untouched — it is just the right blend of tech and common currency. The production version will be introduced to the public at the Detroit Auto Show in January and pricing is rumored to be just under $19,000 when it goes on sale.

Nissan wants to reshape the way we make our way around Gotham, and the Nuvu concept is a means to that greener end. Built atop a new platform measuring around three meters long and featuring an electric drivetrain, Nissan claims that the 2+1 concept is the perfect city car for a better tomorrow.

While the bulbous roofline, squat overhangs and oh-so-cheeky leaf-shaped solar panels (leading into a “trunk” to supply power to the batteries) may be a bit over the top, expect to see some of the styling cues make their way to the revised Note in the next decade, along with Nissan’s production EV that’s supposedly hitting Japan and the U.S. in 2010.

Audi’s parent company Volkswagen already produces some of the cleanest-burning, most fuel-miserly diesel engines in the world. The Jetta TDI was recently released in the U.S. and has been making waves for its hybrid-like efficiency. So it’s natural that Audi would want to show off its green credentials with a new diesel sedan of its own, and it has done so with the A4 TDI concept e, introduced at the Paris Motor Show. Based on the brand-new A4 platform, the new concept gets a 2.0L four-cylinder common-rail direct-inject turbodiesel derived from the unit powering the Jetta TDI. That mill sees tweaks to its valvetrain and cooling systems, lowering its power output a bit to 120-horsepower and 214 lb-ft of torque, but increasing its fuel efficiency a great deal.

Added to the powertrain is a start/stop system that keeps the engine from idling when not needed and regenerative braking, which charges a secondary battery that keeps all your goodies running while the engine’s off. The engine has also had its efficiency-robbing power steering pump removed and the rear brakes are now electrically actuated as well. All of this, plus many other small details, adds up to a remarkable 59 miles per U.S. gallon in EU combined testing! Its 10.5 second run to 60 won’t win any drag races, but considering the cost of fuel and pending eco-legislation in the world’s largest markets, we’d imagine that the technologies on this car will go from concept to production in short order.

Toyota has finally confirmed what’s been rumored for months, that a new hybrid is coming for its upmarket Lexus brand based on the underpinnings of the Toyota Prius. The Prius itself is about to undergo a major reworking, as the third-generation of the iconic hybrid will debut in January at the Detroit Auto Show. According to Lexus officials, the Prius-based Lexus will go on sale in Europe for 2010, and we’re guessing the U.S. will get that model too. A second dedicated hybrid model will reportedly also join the Lexus ranks and be larger than the Prius-based car. We don’t have too many details yet on either of these new Lexuses, except that they will be more performance-oriented than their Prius sibling. A high-luxe Prius, as long as it doesn’t get too pricey, may be just what the doctor ordered for the struggling Lexus brand.

Now that the California Air Resources Board (CARB) has an agreement with General Motors regarding how to measure the fuel mileage of the 2011 Chevy Volt, our attention turns to the EPA, which now has to decide what official mileage rating will appear on the new car’s window sticker and how to determine what that number will be. The first recommendation comes from the Automotive X-Prize, the foundation of which will award $10 million from Progressive Insurance to the winner of its competition to design a production-viable car that people would want to drive that gets 100 MPGe or more.

What’s with that little ‘e’ after the familiar miles per gallon? Basically, the X-Prize crew wants to convert all units of energy to a figure that’s equivalent to the power from a gallon of gas. That way, a car’s powerplant – regardless of where it gets that energy from – earns a rating that can be easily compared with everything else. So, EPA, the ball’s in your court… still.

Been lookin’ for an air-powered 1999 Porsche Boxster? Here’s one, called the MIIN-AER. AutoblogGreen found it at the third annual Alt Car Expo, which starts today in Santa Monica. Over in Paris, they’re getting ready for a VW Passat BlueTDI sedan and wagon, while Detroit is probably already salivating over the 550 new jobs that GM says the Volt will bring.

Inside Line kicked up a dust storm yesterday by claiming that the 2011 Chevy Volt could not recharge its batteries while driving using its on-board, range-extending 1.4L gas engine. 40 miles of electric-only drive was it, and then the battery packs become “400 pounds of uselessness” was what IL said. They got this impression from a press release issued when the production Volt was unveiled to the public, which stated that the gas engine could only “sustain” the battery pack’s charge and not increase it. GM got its communications crossed and apparently confirmed IL’s take, but has thought about it some more and today reconfirmed what we initially thought was true, that the Volt’s gas engine can recharge its batteries while underway.

What the Volt’s gas engine can’t do is completely recharge the battery pack to its full capacity. Rather, when load conditions are light the gas engine will send surplus electrons to the battery pack, which will also be receiving extra charge from regenerative braking, as well. That sounds about right to us, as we’ve always been told that constantly charging a battery to its maximum will shorten its life, as the optimum charge range is usually between 20 and 80 percent, not completely drained and not completely charged. GM is determining right now just how much it wants to let the gas engine charge the Volt’s battery pack, but rest comfortably knowing that your future Volt won’t be carrying around 400 lbs. of uselessness when the charge runs out.

According to General Motors E-Flex spokesman Rob Peterson, the automaker has reached an agreement with the California Air Resources Board (CARB) that would see the 2011 Chevy Volt get a unique classification different from other current hybrids. This new classification takes into account the fact that the Volt’s 40-mile battery range allows it to complete the bulk of the emissions and economy test procedure without ever running the engine, which would likely give it a mpg rating of 100 mpg or better.

This is problematic for the EPA, which considers dual-power vehicles like the series hybrid Volt no different than a parallel hybrid like the Prius. Currently the EPA is expecting the Volt to complete the test cycle with a charged battery, which means the engine would have to run a lot more and essentially kill the charge sustaining control plan. According to Peterson, GM is still a long way from reaching an agreement with the feds on how to test the Volt, despite what the Detroit Free Press says. However, having CARB consider the Volt essentially an electric car is certainly a bargaining chip in GM’s favor.

Hyundai is headed to the Paris Motor Show with a bevy of environmentally friendly models and concepts. In addition to bringing along production-intent vehicles like the new i20, Genesis Coupe and Genesis sedan, the automaker will showcase two new concepts that will also carry its blue theme. Remember, blue is the new green. Anyway, the i20 blue features aero tweaks and low rolling-resistance tires in order to improve its efficiency, but it’s the Santa Fe hybrid that’s a bit more interesting. That new model features an electric motor that puts out 30kW of power along with a 2.4-liter four cylinder engine. Both powerplants feed their power through a six-speed automatic transmission with revised gear ratios optimized for fuel savings. A 270V lithium-polymer battery pack sends the juice to the electric motor, and it all adds up to 38 mpg in the U.S. and carbon emissions of 148 g/km. We’ll be in Paris to see these things up close and personal, so stay tuned.