It would seem to me that 25,000 GR points is worth more as an airline mile than as a GR point.
For example, I would use GRs on Amtrak for Acelka to NY. 10,000 GR's = 1 way first class, which currently sells for $150.
So, if you think you can get more than 1.5 cents per mile in value with airline miles, transferring GRs to airline miles is the way to go.
[This message has been edited by nologic (edited 08-26-2003).]