Buying a used plug-in hybrid, also known as a PHEV, has many advantages. For starters, you’ll save a lot of money on gas, especially if you tend to drive long distances. In addition, used Plug-in hybrids are generally more affordable than buying an all-new PHEV or the all-electric route. Luckily, Kelley Blue Book has compiled a list of the best used plug-in hybrid models to sell for under $20,000. Let’s see which models made the cut.