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It's not quite what you're asking about, but...
Hyundai did on the Sonata hybrid. It runs the engine at high load, diverting the excess output to the battery pack. Then it runs in EV mode until the charge is low. Then it fires up the engine for another pulse. It keeps constant speed, pulsing and gliding the engine and electric mode instead.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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