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.
There are several ways to tell if your car is a flex-fuel vehicle: Check the gas cap. Beginning in 2006, FFV manufacturers started putting distinctive yellow gas caps on their vehicles. Check the fuel door. FFVs often have a sticker inside the fuel door that tells you which fuels can be used.