On some show they had a pilot who owned his own B-25 try to take off in the same distance Doolittle’s pilots did.
He did not even come close to making it.
The pilot explained that they had the advantage of the ship’s speed plus wind at sea can be pretty strong. Also he said they had 115 octane fuel back then.
Doolittle pushed the Army Air Force to adopt 100 octane fuel in the 30s. He also convinced the British to use it and the higher octane fuel was one of the contributing factors to the RAF's success against the Germans during the Battle of Britain.