An engine's efficiency is highest at peak torque, which means that the VE numbers will be highest at peak torque. However, I think I now understand the confusing part of the issue.

Remember, there are more things than just the VE number that determine the ACTUAL AMOUNT OF FUEL being delivered to the engine. Yes, Dave, you are correct in that your engine will require more fuel at high RPM and boost levels than it will at peak torque. However, the fact that the RPM and boost levels are higher will cause the ECU to spray more fuel into the motor. The numbers here are garbage, but I think this example will drive the point home:

At peak torque (6000 RPM, 180 kPa) VE=98, ECU calculates a mass airflow volume of 123456 units. 123456 units x multiplier percentage from VE table = 120987 units of airflow. The ECU will now look at the target a/f ratio (10:1 in this example) and determine that it needs 12098.7 units of fuel.

Let's buzz the motor to 8 grand now and crank the boost. Peak hp.

We are now at 8000 RPM and 300 kPa, but VE number is only 80. Because of the high RPM and boost, the ECU calculates a whopping airflow volume of 234567 units! 234567 units x multiplier percentage from VE table = 187653 units. At the same a/f ratio, your engine now requires 18765.3 units of fuel. A lot more fuel, but the VE number is a lot smaller! The VE number is representative of how your motor flows air at a given RPM and boost level, not simply how much fuel it needs. The amount of air you are flowing is what determines how much fuel is needed.

This has been a fun little thread for the last few days!!

Craig