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Submission + - Driverless Cars Are Giving Engineers a Fuel Economy Headache (bloomberg.com)

schwit1 writes: Judging from General Motors Co.’s test cars and Elon Musk’s predictions, the world is headed toward a future that’s both driverless and all-electric. In reality, autonomy and battery power could end up being at odds.

That’s because self-driving technology is a huge power drain. Some of today’s prototypes for fully autonomous systems consume two to four kilowatts of electricity — the equivalent of having 50 to 100 laptops continuously running in the trunk, according to BorgWarner Inc. The supplier of vehicle propulsion systems expects the first autonomous cars — likely robotaxis that are constantly on the road — will be too energy-hungry to run on battery power alone.

A fully autonomous subcompact car like a Honda Fit, for example, will get 54.6 miles to the gallon in 2025 in the best-case scenario, more than 5 miles below the U.S. emissions target, according to BorgWarner. A small pickup or SUV would be at 45.8 mpg, versus a target of 50.

“They’re worried about one watt, and now you’re adding a couple thousand,”

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Driverless Cars Are Giving Engineers a Fuel Economy Headache

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