Red Bull chief Christian Horner believes Ferrari have produced the best power unit on the grid, ending Mercedes' stranglehold over the sport in the horsepower stakes. A revolutionary method of harvesting electrical energy is reportedly behind Ferrari's speed gains, which has also seen Haas and Sauber make ground in the midfield battle. Sebastian Vettel eased to victory at the British Grand Prix last weekend, with Silverstone becoming as power-sensitive as ever in F1's modern high-downforce era. By contrast, Red Bull were well off the pace and were in a battle of their own to be the third best team. Although Mercedes have had the most powerful engines since F1's switch to V6 Hybrid models,...
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