Matt Whiting wrote in message ...
.........
No, the 20 GPH was on short hops and no speed is given. 24 GPH is
listed along with the 155 speed vs. 27 for 175. I'm with Elliott, this
defies physics. This is almost exactly a linear increase, but we all
know that drag is not linear with airspeed.


Matt

My guess is that the 24/155 was at a lower altitude and the 27/175 is
the "true" speed at the higher 6000ft altitude where the air is thinner
and less drag per "true" speed. If you could shoot yourself into space
you could turn off the engines and get zillion knots for 0 gph.
The basic problem is engine aspiration at higher alt. With turbos
that is less of a problem.