I'm going to be buying some Nokian H tires:
Nokian H
They are less expensive than the Michelin Energy Savers and if they are anything like the Nokian snow tires (that were on the 118mpg economy run winning Honda), then they should be great.
They are 24.4" diameter (851 revs per mile) and they weigh 17 pounds, which is as light as any tires for my xA (185/60/15), and slightly larger diameter than the other tires.
Full disclosure: I'm buying them
from Chang Ho Kim, who was the driver of that winning Honda CRX.