19: Mild Hybrid
When the economic crash of 2008 happened, gas prices were as high as ever. Automakers needed a way to get people back into the showrooms, and thus hybrid models were popular. On many cars, the hybrid name was more of a branding effort than anything (via Forbes).
But automakers like Toyota stuck to their guns and brought these cars to the market. Nowadays, there are all kinds of hybrid models on the market. Although most modern cars get pretty good gas mileage, a hybrid can take it to the next level. Hybrids are more or less the bridge between the old automotive industry and the future.