Good info, here, re the captioned range of Mazda6s' transaxle. Only applicable to non-Turbo models... I think the fellow knows what he's talking about (see the latter posts, which include pictures).
I've noticed in the past couple of months a slight jerk between 35-45mph when slowly pressing the accelerator. It happens both on cruise control and without and seems that cylinder deactivation is not on (just by looking at the animation on the infotainment). It seems to me like the issue is...