Well based on a true story has no real percentage of trueness. Cocaine Bear is based on a true story. It might be more correct to say inspired by a true story b

Well based on a true story has no real percentage of trueness. Cocaine Bear is based on a true story. It might be more correct to say inspired by a true story but it is based on a true story. Based on a true story just means someone somewhere said something like this happened. Bloodsport is a great example of a movie that is based on a true story but that true story turned out to be entirely false.