273,
Your premise in post #1 is wrong, but not all your fault.
The volume [ cfm or any other measure of volume ] of air ingested by the engine is the same at all rpm, based on the CID. What varies is the air's density.
The term VE refers to volumetric efficiency, but it is incorrect, but has been in such common use, it just got accepted over the years. What is being compared is the weight of air being drawn into the engine, not the volume.