This document summarizes different types of vehicles in a junkyard: gas vehicles from 1980-2000s like the Chevrolet Cavalier and Ford Fusion that get about 17 mpg on average; hybrid vehicles like the Ford Fusion and Toyota Prius that get an average of 100 mpg; and vegetable oil vehicles like Mercedes Benz that get about 26.4 mpg. Gas vehicles are widely used because gas has been available longest, while hybrids are increasing in popularity due to better gas mileage and being better for the environment. The document also provides sources for further information.