Sta-bil, PRI-G or Additive Free: Does it Matter?

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mh9162013

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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:



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.
 
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