And because ethanol fuels are typically about the identical value as gas, you might truly spend significantly more cash -- maybe lots of of dollars per yr -- to get round on just ethanol. Considering these details, you could marvel why anyone would construct or buy FFVs. Within the United States, federal Corporate Average Fuel Economy (CAFÉ) requirements dictate that auto makers must supply automobiles with a minimal fuel mileage of 27.5 mpg (22.2 for gentle trucks)