original_query: What is a flexible-fuel vehicle (FFV) or dual-fuel vehicle? What is the most relevant chunk to answer the query?
query: What is a flexible-fuel vehicle (FFV) or dual-fuel vehicle?
answer: A flexible-fuel vehicle (FFV), also known as a dual-fuel vehicle, is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, typically gasoline blended with ethanol or methanol, stored in the same tank.  The engine adjusts fuel injection and spark timing automatically based on the fuel blend.