Third, and final, ADUO analysis of 2026 sees no manufacturers get additional upgrades.

ADUO (Additional Development and Upgrade Opportunities) is the mechanism within the 2026 technical regulations which allows power unit manufacturers whose Internal Combustion Engine (ICE) performance falls at least 2% below the best-performing ICE across defined review periods to introduce additional homologated upgrades to their power unit during the current and following season, but also to benefit from additional cost cap and dyno testing allowances.

The level is calculated over three periods each season, with the level of allowance determined by the size of the performance gap to the leading ICE, which has previously been the Red Bull power unit, despite it being the manufacturer's debut season.

The first review period was concluded after the Canadian Grand Prix, the second review period concluded after the Hungarian Grand Prix and the third review period concluded after the United States Grand Prix.

The FIA has confirmed that the results of the third analysis period of 2026 (Races 12 to 18) have been communicated to all Power Unit manufacturers. For this third period, the relative performance gaps to the leading ICE evolved, but the changes did not result in any additional homologations being granted.

Due to the confidential nature of the information, no further details on performance index measurements will be communicated.

As a reminder, the following results were communicated for period 1 of 2026:

Mercedes was determined to be in the 2-4% window, and are thus allowed 1 additional homologation in 2026 and an additional 1 in 2027, together with corresponding cost cap and dyno testing increases.

Audi, Ferrari and Honda were determined to be above 4%, and are thus allowed 2 additional homologations in 2026 and 2 in 2027, together with corresponding cost cap and dyno testing increases.

For period 2, no additional homologations were granted to any manufacturers.

"The FIA has undertaken extensive analysis as part of the review of ADUO this year," said Nikolas Tombazis, the FIA's Director of Single Seaters. "Based on the quality of the data and the robustness of the assessment process, we are confident in our findings and the conclusions reached.

"The first year of implementation has also reinforced our belief that the ADUO concept is the right one for Formula 1," he added. "However, it is important that the system continues to evolve to ensure it remains efficient, relevant and fit for purpose.

"To that end, we have been working closely with the manufacturers and teams to explore refinements to the methodology that will support the continued effectiveness of ADUO in future seasons."

The next ADUO review period will start in 2027 and will cover races 1 to 6 (Bahrain to Miami).