How many miles are enough for a plug-in hybrid? Readers respond

2017 Toyota Prius Prime and 2017 Chevrolet Volt with Green Car Reports editor John VoelckerGreen Car Reports readers and Twitter followers are clearly fired up when it comes to plug-in hybrids. When we asked in last week's Twitter poll how many miles are enough for a plug-in hybrid, we got two to three times our usual responses. We asked the question because plug-in hybrids come in a variety of shapes, sizes, and capabilities. The main...