We've bought a 2019 Aygo recently, 7350 on the clock, fully serviced but as the air filter is only changed at 4yrs/20k that hadn't been. So I've just replaced it with a new Bosch one.  What a difference, peppier and smoother. I have never agreed with the lengthy intervals they have for these things.  On a more powerful engine the losses can be masked but on something will only 70hp you really notice. 15 quid it cost me.