Ferrari and Mercedes fired the first shots in Formula 1's in-season arms race during Friday practice for the Russian Grand Prix, but so far it looks as though all this has done is maintained the established status quo.
The Scuderia fitted new internal combustion engines to Sebastian Vettel's and Kimi Raikkonen's cars, having spent three development tokens to improve the performance of its power units.
Mercedes spent two tokens of its own - to update the fuel systems on Lewis Hamilton's and Nico Rosberg's current power units, as well as those of the customer squads. Petronas has also added new oil this weekend.