It’s a beautiful day for a drive just north of San Francisco in Marin County, California. Rays of the late-afternoon January sun, beaming between purple-gray clouds like stage lighting, frame stunning vistas of majestic Mount Tamalpais. But behind the wheel of the Toyota Prius that he’s converted to a plug-in hybrid, Ron Gremban isn’t paying attention to any of it. “Look at that!” he says, pointing to the mid-dashboard graphic display showing how much kinetic energy from the car’s brakes is going to recharge its batteries. “Thirty-five amps of regenerative braking. That’s all energy that’s not being wasted.” Elsewhere on the screen is the most important ...
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