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"What is your source for this information?"
The lap time data for the two drivers by race lap. It shows lap times for both drivers dropping as they raced each other from that final pit stop onwards. Webber never slowed down, or even maintained his pace. Both he and Vettel cut faster and faster laps, starting at the same time.
If Vettel was racing while Webber was fuel saving, Vettel would not have finished just 4 secs in front.
If Webber had "turned down his engine" that could not have happen.