Over time, expect Groupon to field a more sophisticated, Amazon-like rating engine to learn more about the likes, dislikes and preferences of its customers.

FORBES: Those are Groupon's Customers, Not Yours

The most efficient Cruze model, the Eco, uses a 138-horsepower, turbocharged, four-cylinder engine and a manual, six-speed transmission to achieve an EPA rating of 28 mpg city, 42 highway.

WSJ: Is Chevy's Cruze Dulling the Spark of its Volt?

Chrysler says this is the highest torque rating of any naturally aspirated (non-turbocharged or supercharged) sports car engine in the world.

FORBES: 2013 Viper Priced Below Corvette ZR1