After more than two years, I finally finished my gasoline sample testing, where I compared various fuel samples in terms of their performance and ability to start in a 2-stroke engine.
My results:
To get a better idea of what these results mean and their context, you can read my blog post: https://gadgetsoftheoutdoors.blogspot.com/2020/09/review-ethanol-free-gasoline-and.html
TL;DR: if you're gonna store your gasoline in a sealed container for less than 2 years, Sta-bil and PRI-G seem to perform the same. And if you don't use any additive, don't worry, your fuel is still very usable, although you'll notice some slight under-performance at full throttle.
My results:
Sample | Number of Pulls to Start the PAS-225 | Idle RPM (“settled on” reading during 45 seconds) | Full Throttle RPM (highest reading during 45 seconds) |
Unopened TruFuel 50:1 | 1 | 3,290 | 10,450 |
Opened TrueFuel 50:1 | 1 | 3,290 | 10,510 |
Ethanol free gasoline with Sta-bil | 1 | 3,280 | 10,700 |
10% ethanol gasoline with Sta-bil | 1 | 3,410 | 10,800 |
Ethanol free gasoline with PRI-G plus 15mL added in March 2019 and 32 mL May 2020 | 1 | 3,420 | 10,660 |
Ethanol free gasoline with PRI-G | 1 | 3,550 | 10,750 |
10% ethanol gasoline with PRI-G | 1 | 3,630 | 10,830 |
Ethanol free gasoline | 1 | 3,310 | 10,730 |
10% ethanol gasoline | 1 | 3,510 | 10,800 |
To get a better idea of what these results mean and their context, you can read my blog post: https://gadgetsoftheoutdoors.blogspot.com/2020/09/review-ethanol-free-gasoline-and.html
TL;DR: if you're gonna store your gasoline in a sealed container for less than 2 years, Sta-bil and PRI-G seem to perform the same. And if you don't use any additive, don't worry, your fuel is still very usable, although you'll notice some slight under-performance at full throttle.