https://www.fleetnews.co.uk/cars/reviews/peugeot-3008-hybrid4
According to this, it’ll struggle to get 40mpg on petrol alone. Does make sense, too. Here’s the specs of the petrol engine itself (it’s the 180hp 1.6 PureTech).
https://www.auto-data.net/en/peugeot-3008-ii-phase-i-2016-1.6-puretech-180hp-automatic-s-s-34446
Keep in mind that the Hybrid is heavier, so it’ll sip more. You could also see how much the Citroen C5 Aircross drinks (maybe there’s more info on that car) – the 225 has the same drivetrain.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.