(not an attack) I would suggest you check how you are driving and maybe try to drive in a more conservative manner (of course terrain/traffic may be the culprit). My recent car usages:

- 2007 Honda Civic (gasoline): 5.9L/100

- 2015 Mazda CX-5 (diesel): 5.6L/100

- 2017 Porche Cayenne S (gasoline): 7.9L/100

- 2017 Lexus IS300h (gasoline + hybrid): 4.9L/100

(Can't remember my older cars consumptions but even those never more than 6L/100)

For reference, I now drive a 2021 Hyundai Kona/Kauai EV. My average is 12kwh/100, though I'm still getting the hang of driving it more efficiently so I'm confident I may get it a bit lower.