What would cause a roaring noise at seeds of 40 in a 2005 Mitsubishi Endeavor It made the sound of rattle I was thinking the it had to do something with the gas I'm using but its plus?

A roaring noise at 40 mph in your 2005 Mitsubishi Endeavor could be caused by several factors, including tire issues, such as uneven wear or improper inflation, or a problem with the wheel bearings. Additionally, it could indicate a malfunction in the drivetrain, such as a failing CV joint or differential issue. While fuel type is unlikely to cause this noise, it's important to have the vehicle inspected by a mechanic to diagnose the exact cause and ensure safe operation.