Min Gas?

[VR78]

Sounds like a reasonable recalculation to me.

30 m: minimum gas 50 bars with D12 and 110 bars with single AL80.
Ascent to 10 m and recalculation: minimum gas 10 bars with D12 (okay I wouldn't go under 30 bars hence 16 minutes extra dive time) and 25 bars with single AL80 (okay 30 bars and actually over 30 min extra time).

 

[Kevrumbo]

For min gas MDL diving, a normal ascent to the surface would use up roughly 25% of your Rock Bottom value at your max operational depth.

So if you & your buddy planned to reserve 40cf each out of single AL80's as RB at 100' for example, you would only use up one-quarter of this volume on a normal MDL ascent all the way to the surface (10cf). But if you're on a nice reef wall in calm conditions with plenty of time at 30' and up, then why not use some of that remaining 30cf to look at stuff, the team surfacing with a final SPG reading of 500psi/30bar. . . ?

See at 15:48 mark in the video below to see how UTD calculated that 25% figure of Rock Bottom: