<div style="text-align: justify">Thanks for the response, Ray! I understand the theory behind your very logical suggestion, but am wondering about the effect of volaitilty of the other components.Surely substances like heptane and naphtha are also volatile to some extent? Any volume reduction due to evaporation of those components would be attributed to ether and would thus inflate the either content measured by this approach. Any comment on this?

The advantage of the Drone testing system is that it directly assesses the behavior of the material in an engine compared with that of straight ether. Its major disadvantage is that it doesn't provide an actual figure for the ether content. I know how my test Drone runs on straight ether (I keep records), sohow it runs on the starter fluid blend gives me a pretty good idea of what we might call the "ether equivalency" of the fluid being tested.Based on Drone tests so far, Gunk Liquid Fire at a manufacturer's claimed 60% ether is marginally equivalent, while Kleen Flo is very nearly equivalent. But of course I still don't know the ether content in Kleen Flo, and the manufacturer's information is not helpful in that regard.

Anyway, I really appreciate your advice!!

Cheers,

Adrian</div>