Have lot's of #20 on hand because I think #20 can be used on most of the circuits in the aircraft because since almost all equipment you'll use is under 7A. For the rest of what you'll need, try to buy smaller quantities as required.
But use the chart to see if you NEED to use a larger wire for higher load circuits. There are obvious exceptions like pitot heat, etc.
RV's are not exactly a forest of wires as would be much larger aircraft so the weight penalty of using #20 even when #22 would do is neglible.
Now if you're wiring up a 747, that's a different story...
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RV7-A - Slider (QB Fuse and Wings)
Mattituck IO-360 (AFP) w/2 P-mags
Catto 3-Blade
SJ Cowl and Plenum
Panel: Dual GRT EFIS / EIS4000 / PMA8000B / SL-30 / SL-40 / Internal GRT GPS / GTX 327
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