Are you ready for some serious savings on gas? A plug-in hybrid electric vehicle is the logical next step for the millions of people who own hybrid cars, and for anyone who wants an extremely efficient mode of transportation. Plug-in hybrids combine the benefits of a pure electric vehicle and a hybrid electric vehicle. In this excerpt from the book "Build Your Own Plug-In Hybrid Electric Vehicle," you'll find answers to your questions about energy savings, environmental benefits and safety concerns. Plus, you'll get loads of statistics on these reliable, economical and environmentally friendly cars. Ready to hop into the driver's seat?