If you go to https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html then there are repeated stateme

If you go to https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html then there are repeated statements about how the rocket did such a good accurate job launching Webb onto its intended trajectory that the telescope hasn't had to use as much of its own rocket fuel as they expected, so the fuel is now expected to last 20 years instead of 10.