Known for its four-stroke 90-degree V-twin engines and its unique valve design, Ducati has carved out an impressive racing record, highlighted by its 2007 Grand Prix World Championship win.

WSJ: At the Heart of Ducati

Honda also makes a 24-valve 3.5-liter V-6.

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Silverado and Sierra will accomplish its new mileage pinnacle with a 5.3L EcoTec3 V-8 relying on direct injection, cylinder deactivation and variable-valve timing to achieve EPA estimates of 16 mpg in the city and 23 mpg on the highway with two-wheel drive, or 16 in the city and 22 on the highway with four-wheel drive.

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