Well, it's one of three things.

Either the person was a ton smarter than I am and knew something about how "weird" humidity conditions or some such nonsense would affect that particular engine less with a different fuel.

Guy was full of bull (My personal belief)

Guy knew there was no way the engine was going to run based on experiance and wanted the pilot to think he was an expert to think of such a novel idea, but regardless, I've never witnessed an engine that wouldn't run on one, and then miraculously ran on another. That's so far fetched to me, that I don't know anyone who's ever suggested that in the circles I run in.

I even won Roger Kirchner over to the concept this season. Roger doesn't run on this site, so he can't defend himself (that's ok, I've known him since I was 12 years old so I can get away with it). But Roger is an SWA Captain and was die hard that these engines had to run on Jet A. But after two years of watching me mix mix mix. This season he was low on fuel grabbed my jug and fueld up with the red dye kero and all. I about fell over watching his UAT get that red glow. He was smiling the whole time getting ready for another flight.

I guess you can teach an old dog new tricks.

Also, Eddie Weeks of this site ran temp and rpm tests between the two. The recorded difference was not mentionable. It was essentially the same in his tests.

I've personally filled up half a tank of jet a, and then ran out, grabbed k1 and finished my fueling. I've done that a number of times in different percentages. It's the same.