Ed H wrote:
Question for all: how accurate are fuel flow meters?

The Cherokee Six I fly has an FS450.
It had been installed for over a year and never calibrated.
After a trip to AirVenture in 2001 with a fuel flow on the guage of 16
gph, imagine my surprise when the fuel truck upload calculated out to 12
gph!
A series of four flights over the next couple months resulted in
tweaking the calibration to where a three hour trip showed only a 0.6
gallon difference between actual fuel used and calculated fuel used.
I couldn't adjust it any better than that.