Your question is essentially about the difference between real world results vs a comparative test result.
https://www.greenvehicleguide.gov.au/pages/ToolsAndCalculators/FuelConsumptionLabel
https://www.carexpert.com.au/toyota/camry/2022-sl-hybrid-d309bbf5
Following review mentioned the fuel efficiency figures of 5.5 and 5.2L/100 km actually achieved and this is for a new vehicle.
https://www.drive.com.au/reviews/2022-toyota-camry-sx-hybrid-review/
How about some very specific details of your friend's Camry i.e. year, mode,l odometer reading etc and some clues about its service history, mechanical condition and the battery etc?
How about data for analysis underlying the 7.6L/100km? This also assumes that the correct fuel 95 Premium Unleaded is being used.