Since I drive a lot, I've always used Mobil1 in the cars I drive, given the longer life of the oil. I think I will definitely switch to synthetic oil at the first scheduled oil change, since now the oil changes are further apart. I might even do that in the '05 Odyssey since it is also equipped with the Maintenance Minder system. I am just not crazy about the idea of running conventional oil for more than 3-5K miles.
Summer driving in GA (with the A/C on) is killing my MPG!!! Oh well...