Depends on the car.
EPA says a Flying Spur should get 10-17 MPG. Eh.. I'm seeing more like 8-15, inversely proportional to how much fun my right foot is having.
For my 2018 Mercedes Mutt (E Class chassis, C-Class powertrain, S-Class interior/electronics), 45MPG. NOT a hybrid, btw.
For my fiancée's 2018 Mazda 6 Signature, a measly 28MPG.
Recent rental cars:
2026 Nissan Pathfinder SL 4WD: 23 MPG
2026 VW Atlas SE w/Tech Package: 27 MPG
Both rented cars were used for Mayo Clinic runs, so would have seen very similar routes and conditions. The Atlas is a substantially larger vehicle than the Pathfinder, yet gets 15% better fuel economy. Better vehicle all-around, btw. The Nissan still used incandescent bulbs everywhere, even exterior lights. Interior lighting was abysmal, so I left my TS10 Max in the center console at all times as it was needed. We had the light interior model too. No flashlights needed in the Atlas, for sure. HVAC also sucked in the Pathfinder. Same with cruise control.