Toto Wolff says it is "crucial" for the development of Mercedes' 2027 car that they understand the full extent of their recent upgrade's potential after a "step in the right direction" at the Singapore Grand Prix.
Source: [Sky Sports](https://www.skysports.com/f1/news/12040/13599493/mercedes-boss-toto-wolff-reveals-latest-verdict-on-car-upgrades-after-unusual-specification-split-at-singapore-gp)