Mazda fuel Consumption Database

[Altuy]

Also just noticed, if i let go of the throttle, the instantaneous km/l skyrockets to 50-60km/l.

That's why most hypermilers use the pulse and glide technique, where they will accelerate for a certain length of time, and then coast for an equivalent length of time.

This is also what I do, been my practice since my years with my then Altis [emoji4]

With my Altis, the instantaneous fuel consumption goes nuts (99 km/l). With my M3 now, it goes 0 L / 100 km.