Great info. But you need to revise your point system for toilets. Depending on which dual flush toilet you use, they could use .8 or 1.1 gallon on the half flush. Their are some dual flush models which never need to use the full flush, so therefore a dual flush might have the lowest average water use. On the other hand, the EPA figures that on a dual flush toilet, you will use the half flush two times for every full flush. Therefore a .8/1.6 gallon per flush toilet would average 1.07 gallons per flush which is less than a 1.28 gallon per flush HET.

Last please note that a dual flush toilet qualifies as an HET as they use on average less than 1.28 gallons per flush. By definition a HET uses 1.28 gallon per flush on average or less.

I would alos suggest that readers look at the MaP report at http://www.cuwcc.com to find the best performing toilet for their own use.