I have a Lancair IVP with the added fuel bay into the aft section of the wing.  These become 55gal each side, confirmed.

What amount have people found is UNUSEABLE FUEL in these wings.  5 gals?  10 gals?  more (per side)?

I'll be exploring this topic soon, and would like to post the question for others before I wait patiently for a dry tank.

Jeff Liegner
N334P