For anyone that’s interested -
I’ve developed a spreadsheet for the SR20 (adaptable for 22) that compares airplane capabilities for various missions - maximizing weight (what is resulting range and duration capability?); maximizing range (what is resulting weight and duration capability?) and maximizing duration (what is resulting weight and range capability?) Looks at SR20 ROP and LOP, SR22, Warrior, and Archer for comparison.
Also has interpolated performance chart, giving odd altitudes.
Finally, has capability to change performance charts for routine shortfall versus book (mine is about 5 knots) as well as impact from LOP operation, reflecting reduced speed and reduced fuel flow.
Not rocket science, but possibly helpful. Please respond via e-mail or this board - happy to share. Usual caveats - no guarantee I didn’t make an input mistake!