Fuel Flow Monitoring

* This is an outgrowth of the hot starting fuel injection thread

For those of you who have JPI or EDI fuel flow monitoring:
a) how many flights did you make before it was "calibrated"?
b) how much variance do you see from flight to flight?
b1) do you fly approximately the same altitudes/power settings each
flight?


My case:
I rent a 1978 Cherokee Six with an FS-450.
I flew it to Oshkosh 2002. Keeping track of flight and leg times on
each of the four tanks, I learned that the gauge was reading 25% too
high.
As I was more interested in flying than playing with the flow gauge, it
was not until last month that I finally got around to performing the
first correction.
As I said, it was reading high, so the correction is to add the
percentage of the currently indicated K-factor to that K-factor.
That done, a second flight was flown and the times and quantities
recorded. This time, the flow was 13% low.
Subtract this percentage from the current K-factor.
Go fly again, record time and quantity. High by 13%. Add that to the
current K-factor.
The subsequent two flights were 0.4 gph over and 0.1 gph over.
Close enough!