The 2020 Toyota Prius Prime is a plug-in electric version of Toyota’s bestselling hybrid. It gets 25 miles of quiet electric range, and when that juice runs out it still gets 54 mpg, according to the EPA. The Prius Prime outdoes the Hyundai Ioniq plug-in to reign as fuel-efficiency champ. For now. But with more plug-in hybrids and electric...
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