On 12/22/2025 2:23 PM, Kayak via KRnet wrote:
this is interesting and scary. my own goal would be to be able to run auto fuel reliably. IF possible.  but at this point since I have no kit nor plans to build, just an academic question.  "back in the day" I had a Grumman AA1 with auto fuel STC and it worked fine, AvGas was $1.93 and car gas was $1.35. but that was before this stupid ethanol travesty started. :)

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And summer and winter blends and California only blends and, as Jeff Scott found out the hard way, all the different unknown additives that different suppliers put in their mix.  There are probably a number of auto fuel suppliers that sell a compatible product but "consistent dependability" is hard to come by in today's market.  Is doing a time test on every 5 gallon jug of fuel worth the dollar savings?  Does every airport selling "auto fuel" do a "time test" on every batch of auto fuel or simply the standard daily test for water / impurities? And, even airports that sell a good mix of "auto fuel"  probably sell limited quantities in relation to their tank volume.  How long has that last delivery set in their tanks and has the quality held over time?

As always, YRMV.....................

Larry Flesner
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