My yaris 1.0 smokes 8.3 to 8.5 in the city and on the road, depending on the leg, recently took 10 letters on WOT because I was in a hurry. When I drive gently, it's 7.x liters on the road. Everything depends on:
* Conditions in which the car moves, i.e. traffic jams, driver's leg,
*Engine condition, i.e. compression, oil, timing,
* Temperature and time of switching to gas,
*Correct adjustment with AFR.
*Tire condition and geometry including pressure....
* A million other factors, e.g. climate.....
If you want an economical car, buy it with a strong EGR or variable phases, every other kronkiel in the otta cycle will not have exorbitant economy. Well, unless a short gearbox for a larger engine really improves economy.