I saw the story about the successful complaint against Toyota. Bravo!
The tank is 22.5gal according to this forum's knowledgebase...
http://vehicross.info/modules.php?na...warticle&id=29
How low (much) fuel you burn before refilling is a good point. Because of these goofy, bouncing gas gauges, some might consider it empty at 1/4 tank. Others might blow it til fumes.
Mine has 16" wheels w/31" (street) tires -- which I thought would raise mpg. Maybe it doesn't. 4:30 gears seem awfully steep for optimal MPG.