This will increase engines from 6 to 9. SpaceX will also increase fuel to about 300 tons. This will enable a larger Starship and Superheavy to launch 220 tons to orbit instead of 150 tons.

On December 17th, the Elon confirmed a tweet from three months ago.

The SpaceX Starship would be stretched about 5-6 meters with larger fuel tanks.

The full refueling of Starship in orbit would drop from 8-9 launches down to 7.