Aaron Coolidge wrote:

Jay Honeck wrote:

: BTW: What planes don't have mixture controls? (Beside turbines and jets?)
A lot of older, pre WW2 airplanes with small engines, less than 85 HP.

And the newly certified Liberty XL2 (prolly will be the case with all
FADEC engines). I wonder if it will be possible to get an autogas STC
for a FADEC engine like that.