[Tom Vaught]

The owner issues I identified were:
a) Not enough timing on one vehicle for a clean combustion process.
b) Need to replace a metering block after a "carb expert' did his magic.
3) Throttle Blades in the wrong position causing issues with the engine wanting to die below 1000 rpm
4) Selecting the wrong power valve for the application (5.0" power valve changed to 6.5" then back to 5.0" valve after other changes made to the engine system.

There are several more but the point is even with a good air/fuel meter, years of experience, and in this case access to a wheel dynometer, the car still need to drive properly for that specific engine combination.

Lastly. F.E. was optimized for several combinations but some drivers would just like a great running engine and are willing to give up some F.E. for other attributes: (Horsepower, quarter mile times, aggressive driving.)

Have a nice evening and a great Thanksgiving, back after the Holiday on this one.
Next mode is Power Valve, what it does and where.

Tom V.