Ferrari’s growing concern over Mercedes’ engine superiority in the 2026 Formula 1 season is no longer focused purely on raw horsepower numbers. According to reports emerging from the paddock, the Scuderia increasingly suspects that Mercedes may have found a sophisticated technical solution involving fuel technology that could be contributing to the widening performance gap between the two manufacturers.
While Ferrari continues to receive widespread praise for the quality of the SF-26 chassis, especially on circuits requiring strong mechanical grip and aerodynamic balance, the power unit situation remains a serious limitation for the Maranello team.
Many inside Formula 1 believe Ferrari currently possesses one of the strongest overall chassis packages on the grid, which is precisely why the Italian team entered the Monaco Grand Prix as one of the favourites for victory. However, Monaco’s unique characteristics are unlikely to fully reflect the broader competitive picture across the remainder of the season.
Outside of low-speed layouts, Ferrari continues struggling against the straight-line performance and energy deployment efficiency of Mercedes-powered cars.
Ferrari worried about increasing Mercedes horsepower advantage
According to reports from the Italian media, Ferrari originally estimated at the beginning of the 2026 campaign that its power unit deficit relative to Mercedes stood at approximately 20 horsepower.
However, recent telemetry analysis and race data have reportedly convinced Ferrari engineers that the gap may now be even larger than initially feared.
The situation becomes even more intriguing because speculation surrounding Mercedes’ power unit first emerged during the winter development phase, when rumours circulated throughout the paddock regarding a possible exploitation of a grey area inside the Formula 1 engine regulations. At the centre of the discussion was the possibility that Mercedes had discovered a way to operate beyond the officially permitted 16:1 fuel compression ratio through the use of a specially engineered fuel composition.
According to the rumours, the alleged system would require a very specific fuel blend capable of unlocking additional combustion efficiency and therefore extra horsepower from the internal combustion engine.
Most importantly, the supposed advantage was believed to remain extremely difficult for the FIA to detect using the governing body’s existing testing procedures.
The FIA prepares stricter checks from Monaco onwards
Formula 1’s governing body has now reacted to the growing controversy by modifying the testing procedures used during power unit inspections.
From the Monaco Grand Prix onward, the FIA will reportedly begin analysing engines under hot operating conditions — around 130 degrees Celsius — rather than conducting inspections only at ambient temperature.
The change is specifically designed to eliminate any potential loopholes related to thermal expansion and fuel behaviour under race conditions.
Furthermore, additional reports suggest even stricter inspections could arrive later in the season, potentially from August onward, as the FIA attempts to definitively settle the debate surrounding Mercedes’ power unit performance. Despite the increasing speculation, Mercedes continues insisting that its engine performance remains fully legal and that the new FIA directives will not alter the competitive picture.
Sources from Mercedes’ Brixworth power unit division reportedly maintain that the upcoming clampdown will change absolutely nothing regarding the operation of the German manufacturer’s engine.
Still, several rival teams will be watching extremely closely over the next few races. Any sudden performance regression from Mercedes-powered cars would inevitably fuel further speculation inside the paddock.
Petronas fuel development already attracted attention earlier this year
The controversy becomes even more fascinating when considering reports that emerged before the start of the 2026 Formula 1 season. Back in February, several publications claimed that Petronas had been involved in a race against time to secure FIA approval for Mercedes’ latest fuel specification ahead of the opening race of the year.
Mercedes team principal Toto Wolff strongly rejected any suggestion that the fuel package failed to comply with the regulations, firmly dismissing concerns regarding legality.
Nevertheless, the combination of those earlier reports and Ferrari’s current suspicions has only intensified scrutiny around Mercedes’ technical advantage.
Ferrari hopes ADUO system can reduce the deficit
At the moment, Ferrari’s best hope of reducing the gap lies in the ADUO system — the Additional Development and Upgrade Opportunities mechanism introduced under the 2026 Formula 1 regulations.
The new framework is specifically designed to allow struggling power unit manufacturers additional freedom to close performance deficits relative to the category benchmark. However, meaningful engine upgrades through ADUO are still expected to take several months before arriving on track, leaving Ferrari forced to maximise the strengths of the SF-26 chassis in the meantime.
Lewis Hamilton and Charles Leclerc have both repeatedly extracted strong performances from the car in recent races, particularly on circuits where aerodynamic efficiency and tyre management can partially compensate for the engine shortfall.
Still, the broader concern inside Maranello remains clear: unless Ferrari can recover significant horsepower over the coming months, consistently fighting Mercedes across a full Formula 1 season may become increasingly difficult.
Mercedes-powered teams continue dominating the field
The current competitive hierarchy only reinforces Ferrari’s concerns. In addition to the factory Mercedes team, customer outfits McLaren, Williams and Alpine have all shown strong straight-line speed and highly competitive race pace during various stages of the 2026 season. That widespread performance level further strengthens the perception that Mercedes currently possesses the benchmark power unit package in Formula 1.
Whether the FIA’s tighter inspections will alter that balance remains one of the most intriguing technical storylines to follow during the second half of the championship.
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