Looking at the secondhand market, iSeeCars.com zeroed in on 2.2 million vehicles from model years 2013 through 2015 that were listed and sold in the first five months of 2016. Compared to the 42.5 average days for a gasoline car on the used market, electric cars took just 29.2 days to sell. Plug-in hybrids (40.7 days) and standard gas-electric hybrids (38.2 days) also beat gasoline cars in the study. Five out of the 10 fastest-selling used models were either a hybrid, PHEV, or EV.