Alon A2 unusable fuel?

9 per wing plus 6 in the header = 24. What part of that is usable vs unusable?

If SB-19 has been complied with the useable fuel in the fuselage tank is reduced by 15.5# from the 36# available at fuselage station 7. It would be wise to not plan on using any of the fuselage tank's fuel as Warren stated ( with the standard fuel system).

you have 18 gallons in main tanks 6 gallons in the header. That said there was a few Alon and Ercoupes mod to 15-gallon main tanks. So they had 30 gallon in the mains. So usable is 24 before you become in free fall.

does anyone have any hard data on usable/unusable fuel on the Alon? or any good guesses?)

I need the data for an engine monitor upgrade