No extra F1 engine upgrades after third ADUO evaluation

The FIA has decided not to offer any engine manufacturers additional power unit upgrades following the third Additional Development and Upgrade Opportunities (ADUO) evaluation of the season. The evaluation period concluded after the United States Grand Prix, and, as with the second, no further engine homologation opportunities will be offered.

The only time extra upgrade opportunities have been awarded was after the first evaluation period, which ran up to the Canadian Grand Prix. Red Bull-Ford were found to have the top-performing power unit, while Audi, Ferrari and Honda were more than 4% less powerful and received two extra homologation opportunities this year and two next year. Mercedes, within 2% and 4% of the leader, received one extra upgrade this year and next.

The FIA's single-seater director Nikolas Tombazis defended the system, saying the team was confident in its findings, but indicated the methodology may be refined in future seasons. He said: "The first year of implementation has also reinforced our belief that the ADUO concept is the right one for Formula 1."