Pseudoscience describes any belief system or methodology which tries to gain legitimacy by wearing the trappings of science, but fails to abide by the rigorous methodology and standards of evidence that are the marks of true science.
1 Flex-fuel hybrid electric and flex-fuel plug-in hybrid are two types of hybrid vehicles built with a combustion engine capable of running on gasoline, E-85, or E-100 to help drive the wheels in conjunction with the electric engine or to recharge the battery pack that powers the electric engine.
Flexible-fuel vehicles in the United States. Flexible-fuel vehicles in the United States are the second largest flex-fuel fleet in the world after Brazil, and there were about 17.4 million flex-fuel cars and light trucks in operation by the end of 2014.