Toro Rosso drivers Pierre Gasly and Brendon Hartley are to use Honda’s previous specification power unit at this weekend’s Mexican Grand Prix. Honda introduced its Spec 3 power unit in Russia and ran it throughout the events in Japan and the United States, with both drivers buoyed by the progress made with development. However, Honda says it has a 'better understanding' of its previous spec power unit in order to deal with the higher altitude conditions found at the Autodromo Hermanos Rodriguez, which lies over 2,000 metres above sea level. Honda has nonetheless used the opportunity to take on fresh Spec 3 components for Gasly’s car for FP1, meaning the Frenchman will...
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