Through some circumstantial evidence, “rumblings” and tea leave-reading, Autoweek has come to the conclusion that General Motors may unveil a new Cadillac model at the Detroit Auto Show powered by the Chevrolet Volt’s range-extending hybrid powertrain.

Rumors of a Caddy-badged Volt have been circulated since earlier this year, with Bob Lutz and other GM execs hinting at the possibility of new hybrid model joining the Cadillac line-up. Lutz told reports back in September that “there’s definitely room” for an eco-conscious Caddy and that “there’s going to have to be some kind of dramatic environmental statement” from GM’s luxury brand. So what form could it take?

Opel and Vauxhall versions of the Volt are already planned, but a Cadillac variant would likely be a small- to mid-size crossover. Just such a vehicle is slated to arrive in the second quarter of 2009 – the next generation SRX — inspired by the Provoq concept unveiled earlier this year. While the Volt is supposed to carry a price tag of around $40,000, the range-extended, plug-in hybrid CUV from Cadillac would be priced significantly higher, and that could help GM recoup some of the costs associated with the Volt’s advanced drivetrain development. We’ll know for sure in a few weeks time.

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Here in the U.S. market, the name Electra was used on big Buick sedans for more than four decades but it hasn’t appeared in a new car showroom since 1990. It looks like the Electra could be be making a comeback soon, but not in America. It turns out that Vauxhall, the brand that GM uses to sell right-hand drive Opels in the UK, filed a trademark application back in June for the Vauxhall Electra. GM officials have acknowledged previously that both the Chevy Volt and an Opel badged E-Flex vehicle would be offered in Europe. The Opel/Vauxhall vehicle will likely be based on the Flextreme concept that was shown at last year’s Frankfurt Motor Show. The Electra (if that’s what it’s called) will likely debut sometime in 2011. Saturn is also expected to get a version of the Flextreme here in the U.S., and it will be interesting to see if it revives the Electra name here. Continued

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As part of its Centennial celebrations, GM finally took the wraps off the production version of the long-awaited, all-electric Chevrolet Volt that will be available in the States in late 2010. As many might remember, GM’s media partner had released a few teaser images (by mistake) of the Volt in early September but now we have the Full Monty. Just hit the jump to check out the preliminary specifications as well as the initial details and a high-resolution image gallery that includes photos of the production interior. And stay tuned as we’ll be bringing your more information and media content throughout the day. See photos after the jump Continued

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With enormous V8 land-yachts and even bigger Escalades rolling down America’s boulevards, Cadillac’s doesn’t have the most environmentally friendly of images. But that’s a perception that the premium GM division is working hard to combat. After unveiling the Escalade two-mode hybrid, reports have begun to surface that Cadillac is considering a four-cylinder model for the American market like the Saab-based BLS it offers in Europe.

New emerging reports now suggest that Cadillac might get its own version of the highly-anticipated Volt plug-in hybrid from its sister-company Chevrolet. No telling at this point if the Cadillac version would be based on the Volt, transplant the Volt’s powertrain into an existing Cadillac model, or breed an entirely new Caddy – or for that matter if there’s any substance to the rumors – but sources suggest a higher sticker price than the Volt’s anticipated $40k.

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First off is the idea of the E-Flex platform operating entirely free of batteries, with the engine/generator simply running continuously and feeding electricity to motor. While this is certainly technically possible, the current E-Flex system is not architected for that possibility. The generator has no direct connection to the motor, rather it feeds the battery. The engine is designed to run at constant speed and wouldn’t achieve anywhere near the efficiency if it had to provide transient operation. Because the motor requires more power on demand for acceleration, the engine would have to speed up. In this usage scenario, the efficiency losses of converting mechanical to electrical and back to mechanical power would come in to play as described by Toyota and others when they criticize the whole concept. A conventional parallel hybrid would actually be preferable in this case. The whole premise of improved efficiency from E-Flex is built on the idea that the vehicle will run off grid energy the majority of the time.

The other possibility that Lutz mentions is eliminating the engine/generator and going battery only. This is actually not a new idea and was discussed as a long-term possibility back in late 2006 when GM held the first background briefings on the Volt prior to its auto show debut. The idea is that if battery technology progresses to the point that a Volt type vehicle could provide a reasonable electric range without a range extender just by using a bigger battery, it could easily be done. The idea is mentioned in the first E-Flex technical description I wrote here. Finally, Lutz indicated that within the next two weeks he will be taking an initial test drive in a real Volt prototype. According to Scott this is an actual Volt prototype not a Malibu-based mule. I find that unlikely at this stage. A mule drive is almost a certainty though.

Update: Rob Peterson at GM confirmed that it is only a mule that Lutz will be driving. Actual Volt prototypes are still many months away.

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