Correct Mr. CaveJ is. I personally think Winds Aloft would be sweet, especially for scenarios with larger arenas...
As to an "optimum" altitude... Since I basically only fly The Stang, I usually take off from a rear base, and climb up to 15,000... Then I cruise climb up to at least 25,000. I'll usually go on up to 30,000, especially if I plan on going a long way. Even with the external tanks, I can motor around at 325+ TAS at 45 InHg... As to short hops over the mountains, I'll still get up to 20-25K every time. Dunno about short hops between fields not separated by mountains, never done that.
blk (AT)