The information and data presented were collected from the following sources. Some statistics were based on calculations based on that same information and data. 
 

https://www.fueleconomy.gov/feg/atv.shtml

https://www.nap.edu/read/12204/#slide2

https://www.eia.gov/tools/faqs/faq.php?id=427&t=3

https://www.eia.gov/tools/faqs/faq.php?id=73&t=11