I sell all of the Toto toilets, and a lot of the 1.28 gallon WaterSense Drakes.
If you need a taller bowl, then the Toto Dalton CST733F works well.
16-1/8" high bowl.
It's a 1.6 gallon.
The EcoDrake bowl is only 14.5" tall.
Most tall bowls, like the Drake ADA are 16.5" tall and 28" long.