In article , Roger Long wrote:
This engine has very good mixture distribution and I've been experimenting
with running it slightly lean of peak in cruise.

It's funny, for all the ill reputation the O320-H2AD engine got as
fitted to a C172N, all the ones I've flown have had very good mixture
distribution and don't go rough as you lean the mixture out - the RPM
just starts dropping as you get too lean.

--
Dylan Smith, Castletown, Isle of Man
Flying: http://www.dylansmith.net
Frontier Elite Universe: http://www.alioth.net
"Maintain thine airspeed, lest the ground come up and smite thee"