Here are a few simple tags to help keep your different gas-mix ratios apart. I have included tags of 32:1, 40:1, 50:1, and even 16:1 for older engines. (I'm looking at you, Maytags!) NOTE ABOUT PLASTICS AND GASOLINE: I placed scraps of PLA and ABS into a jar of gasoline and let them sit. After 48 hours, the ABS was a pile of goo and while PLA seemed unaffected. Since these tags may come in contact with gas or gas fumes, I would highly recommend PLA or possibly Nylon(?). REVISION: Added 100:1 and SMOKE tags.I started with the darker blue, cut the filament at the half-way point, and fed in white to finish off.