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Great math ! something i am not so great at, simply a high school education for me, but I do understand those figures and how you came across your answers.
I wanting to ask you if you have tried a tuning box on your tdi.
As I have had great success with a $50 ebay tuning box, it hooks into the wiring harness under the hood between the fuel pump and the ecu.
My understanding is that the box intercepts the fuel temperature signal from the fuel pump to the ecu and tells the ecu that the fuel is colder than it actually is,this causes the ecu to adjust the fuel pump timing and duration.
It actually works excellent on my TDI, which is the AGR version very similar to the ALH only with the k03 turbo instead of the ALH's vnt turbo.
{1998-2003 i think}
I noticed as much a 10 mpg improvement on the hwy and my city figures have improved 5 mpg, The tuning box is advertized to improve fuel economy by up to 30% and hp 25% and torque by 50 ft lb
I will be damned, that cheapo ebay tuning box did make close to those numbers, my car has what seems like a 40% improvement in power its really peppy now and gets a big boost in fuel economy.
If anyone has a AGR or ALH tdi i will recommend this tuning box-
for other diesels and gas cars I will not recommend a cheap box as this box is the only one I can vouch for with my motor combination.
it was a set screw adjustable analog tuning box for the Volkswagen diesel engines equipped with VP37 injection pump, it was a proracing brand,i think.
I do not know why this cheap box works so well, it literally gave my car a huge boost in power and really did improve my fuel mileage, as long as i drive very light on the throttle, i generally use the first 1/8 to 1/2 of a inch of throttle in most of my driving.