Mercedes recently started delivering the AMG One hypercar, but it seems that testing of prototypes is still underway. A total of four prototypes were spotted at a rest stop in Granada, Spain, accompanied by a GT 4-Door Coupe in the 63 S variant from Affalterbach. This sighting is special because the F1-engined hypercar will be a rare sight, with only 275 customer cars being produced.

It is unclear what Mercedes was testing, considering that production of the One began over a year ago. The possibility of a successor hypercar has already been ruled out due to the challenges of meeting emissions regulations. With the Euro 7 standard coming in 2025 and the increased stringency of emissions regulations, it is unlikely that another F1-inspired car for the road will be developed. However, the hybrid technology developed for the AMG One could potentially be utilized in future performance models from AMG, even though the 1.6-liter V6 engine might not be used again in a street-legal car.