"I think the mileage is computed from the injection volume, not the tank level."
And the injection volume is computed by the 'puter monitoring engine speed and the duty cycle of the injectors.
So the fuel actually used isn't really MEASURED.
The number the 'puter comes up with will only be perfectly correct if all the injectors are absolutely at exact flow "spec", and the gas temp/specific gravity is exactly what the system was calibrated at.
So, the mileage the 'puter shows you is actually an "educated guess".
A while back, some rumors were going around that certain aftermarket "chips" achieved better mileage on the "digital dash" by mucking with the software the 'puter uses to calculate MPG.
Whether true or not, I'm sure that would be possible.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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