Actual Fuel Capacity on my 34 PC


ParaDocs

New member
I own a 2021 34PC. I'd like to have an accurate measurement of my fuel capacity.
The specs say it has 190 gallon capacity. When I reached out to Formula they said they allow 10% for expansion so that I only have 164 gallons usable. That math doesn't make sense to me because 190 - 10% = 190 -19 gallons which should allow me with 171 gallons usable. Not sure where they came up with 164.
Other issue is the fuel capacity reading on my Mercury monitor does not correlate with what I can fill up with at the actual pump.
For example: When I fill up at the pump the Mercury seems to max out at 160 gallons - give or take a few gallons (sometimes it will say 157, the highest it ever reads is 161). The gauges above the monitor seem to max out at about 19/20ths never quite going all the way.
However when I actually fill up at the pump it does not correlate with the amount on the display.
Some examples: 1. Recently went on a long trip - started with full tanks - reading 160 gallons on my Mercury display - when I arrived and came off plane it was reading 0 gallons. When I filled up at the pump it only allowed me to put in 145 gallons which brought me back up to reading 160 gallons. This is a discrepancy of 15 gallons between the change on my display & the actual amount of gas I could put in.
2. On the reverse trip - again started with full tanks - reading 160 gallons - when I arrived it read 7 gallons. A the pump it only allowed me to put in 140 gallons to bring me back up to 160 gallons. In this case a discrepancy of 13 gallons (i.e instead of needing 153 gallons to go from 7 to 160 it only took 140)

Is this some sort of calibration issue?
Does anyone know the real numbers in terms of usable fuel?
I've heard they keep some in reserve but I would like to have an accurate idea of how much fuel I have so I could avoid any issues.

Thanks for any help
 
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