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.
The 5.3-liter flex fuel V8 gets the same gas mileage as the regular 5.3-liter when using gasoline; however, when using E85, gas mileage drops to 10 miles per gallon in the city and 15 on the highway, according to the EPA.