Mercedes has vowed to catch F1's runaway Renault-powered teams, as it risks losing millions in Concorde Agreement bonus money.
Formerly looking set to finish second behind Red Bull in the lucrative constructors' championship, Mercedes had a bad weekend in Japan and is now ten points behind Ferrari.
Not only that, Lotus - whose Romain Grosjean was challenging for victory at Suzuka - is no longer far behind in the teams' title chase.
Mercedes, on the other hand, has lost ground.
"Red Bull has taken a big step forward since Singapore," Toto Wolff told Germany's Auto Motor und Sport, adding that the similarly Renault-powered Lotus is now a few tenths ahead.
"We need to analyse...
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