Mercedes boss Toto Wolff believes the performance between Formula One's three leading engine manufacturers is now "pretty close''.
After delaying the introduction of its new upgraded power unit in Montreal, Mercedes brought its 2.1 specification to Paul Ricard. Lewis Hamilton made the most of its new upgrade as he dominated from pole position to win in France for the first time in his career.
When asked if Mercedes has the best or joint-best engine in F1, Wolff replied: "Very difficult to say, because when you look at yesterday's data, the quickest car on the straight was Kimi, but we believe he was maybe running a different aero configuration.