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General Motors has released an update on the 2011 Buick Regal's 2.0-liter turbocharged engine that enables it to run on any blend of gasoline or E85 Ethanol. The Detroit automaker claims the Regal's flex-fuel capability is a first for a direct-injected turbocharged production car.

There are no performance differences between the standard 2.0-liter turbo engine and its flex-fuel variant, as output remains at 220 horsepower and 258 lb-ft of torque.

However, engineers made some changes to allow the engine to run on E85. Given that ethanol needs a richer air-fuel mixture than gasoline to function properly, the flex-fuel engine is equipped with higher flow-rate injectors. In addition, a sensor in the fuel system measures the combination of gasoline and ethanol in the tank (a maximum of 85 percent is allowed of the latter), allowing the engine management system to automatically adjust the mixture to provide the required performance, emissions and fuel consumption.

GM's 2.0-liter Ecotec turbo engine also sports a new sand cast aluminium cylinder block, which translates into better durability, less noise and vibration than before.

The Regal's engine update is a step towards GM's goal of having more than 50 percent of its production in flex-fuel models by the end of 2012, with the company having already put on the streets more than 5 million flex-fuel cars in the last 15 years.

By Dan Mihalascu

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We're pretty proud of the fact that over the years, many of our readers here on Carscoop have seized the moment to become the ones who create the news with their spy shots, like Nick K. who snagged the first ever photos of the Toyota Prius minivan last September.

The latest reader to join our list of car-scoopers is Jay Davis who photographed a heavily camouflaged four-door sedan prototype in California. "I saw this test mule in Agoura Hills, CA today. It had Michigan manufacturers plates. Not sure what it is," Jay told us.

A lot of names including Nissan, Buick and Lincoln were thrown around during our chat with Jay, but ultimately, we're still in the dark about the brand and model hiding beneath the camo. Can anyone help us solve the mystery? Leave your thoughts in the comment section after the break.

Many thanks to Jay for the scoop pics!

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If you were wondering how General Motors was planning to differentiate the 2012 Buick Verano from its Chevy Cruze counterpart, wonder no more. According to Buick, its newest addition will offer the quietest ride in its segment thanks to heaps of laminated glass, triple door seals and a host of other muting technologies. Buick calls the cabin "library quiet," though there's no word as to whether the interior smells of old books. They've also made sure to throw in the same levels of refinement as found in the likes of the Lacrosse, and drivers can expect to find the same high-quality leather and a host of tech goodies as the bigger four-door.

That's all fine and good, but we're more excited about what Buick has thrown under the hood of the 2012 Verano. Buyers who opt for the base car will be met with a 2.4-liter four-cylinder engine capable of 177 horsepower and 170 pound-feet of torque. Mated to either a six-speed manual or a six-speed automatic transmission, Buick is shooting for around 31 mpg highway. The really juicy news is that the Verano will also be available with the same turbo 2.0-liter four cylinder found in the Regal Turbo, and again with your choice of six-speed manual or automatic! That means this significantly smaller, lighter four-door will be available with a full 220 horsepower.

• Vehicle Type: compact car
• Drivetrain (CG estimates)
• Drive wheels: front
• Engine: 1.8-liter 4-cylinder, 1.4-liter turbocharged 4-cylinder
• Horsepower: 136 (1.8), 138 (1.4 turbo)
• Torque: 123 lb-ft (1.8), 148 (1.4 turbo)
• Transmission: 6-speed automatic, possible 6-speed manual
• Dimensions (CG estimates)
• Wheelbase: 105.7 inches
• Length: 178.5 inches
• Width: 70.7 inches
• Height: 58.2 inches
• Base curb weight: 3,150 pounds

Buick is a division of General Motors which sells vehicles in the United States, Canada, Mexico, China, Taiwan, and Israel by General Motors Company (GM). It is GM's North American-based entry-level luxury brand. Buick holds the distinction as the oldest American make.

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Following the launch of the Regal, Buick will be introducing its next all-new model sometime in 2011. Set to launch as a 2012 model, the Verano compact will slot in beneath the Regal sedan, though we've been told on several occasions that it will not share a platform with General Motors' other new small car, the Chevrolet Cruze.

According to the infomongers at GM Inside News, the automaker recent sent a letter to its Buick dealers inviting them to participate in an order study in an attempt to gain knowledge about what pricing and trim levels would be most attractive to potential buyers. The details, available after the jump, reveal that the Verano will be powered by a 2.4-liter inline-four (same as the Regal) that produces 180 horsepower and 172 pound-feet of torque, mated to a six-speed automatic transmission, and will be initially offered in four trim levels.

If the letter is to be believed, the base Verano 1SB (the alphanumeric likely being an internal designation) is estimated to start at $20,900. From there, the 1SD model adds Bluetooth, automatic climate control and remote start, and will be priced from around $22,100. 1SG models add a power driver's seat, heated mirrors and rear park assist and should command roughly $23,300. Top-trim 1SL Veranos will have heated leather seats, premium audio, a heated steering wheel and 18-inch wheels. Expect the top-rung 1SL to retail for around $25,600, with pricing reaching as high as $26,200.

We don't expect GM to reveal official Verano specifications and pricing until closer to its launch date, with the car being officially debuting sometime in the early 2011 auto show season. Top tip, Ed!

[Source: GM Inside News]