To really find out the true effect of a CAI it is a big job.
You need at least two vehicles,
and need to swap the modification between the two vehicles
either at a dragstrip over multiple passes,
or even better with the two vehicles doing side by side wide open throttle steep hill climbs, preferably in one gear.
Manifold Air Pressure sensor and Intake Air Sensor readings would ideally be recorded too.

Owners routinely underestimate the effort to correctly test either CAI or MPG.