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This Engine Saves Gas By Shutting Down Most of Its Cylinders

Engadget

The V8 Denali I'm about to drive isn't known for its fuel economy. But the huge GMC SUV isn't your usual over-sized grocery-getter. It's outfitted with Tula's engine optimizing Dynamic Skip Fire technology that reduces the amount of cylinders running at any moment to boost energy savings. So while all eight of them are firing when I take off from a stop light, once I'm at cruising speeds, the car settles into firing an average of two cylinders.

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