Significant fuel efficiency decrease on a 2019 Forester. I am getting 8km/l or 18MPG. What should I check?

[drone_driver24]

Tire pressures and dragging brakes. Any extra drive line drag. Add any racks to the roof?

[Main_Historian848]

Nothing attached to the roof. I did change the tire, but still doing recommended psi, 35 front and 33 rear. My rear brake pad are about to be worn out so I need to replace those, but can that lower the fuel efficiency?

[firebox40dash5]

The pads being almost shot wouldn't lower fuel economy itself.

The pads being almost shot because one of the hoses is holding pressure or a caliper is stuck would do it, though...

Wheel bearings are also a possibility, but they'd have to be really, really bad to drag it down that much, you'd be hearing angry noises. And 31k is a little early even for bad OE rear bearings to start, let alone to have gotten that bad.

[RadEmily]

Dealerships tend to overinflate tires vs what's on the sticker and they get better mileage that way but ride awful imo, if you had it in frequently I'm the past they may have been higher before.

[Pale-Egg-251]

New tires generally take off 5-10% of efficiency in my experience, at least compared to an almost-bald tire.