A Prius being converted into a plug-in hybrid The Department of Energy has now logged more than 1 million testing miles with their fleet of plug-in hybrids , and they’ve collected some interesting data . First, driver behavior, charging frequency and environmental conditions have significant impact on plug-in hybrid efficiency. Second, driving patterns suggest per day driving range is much less than expected. Third, forgetting …

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After 1 million miles, intersting plug-in hybrid results

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