The MaP testing for this is 1000 grams.
It has a 3" flush valve from tank to bowl.
Gerber 20-832: 21-832 bowl, 28-830 tank
Performance wise it should be fine.
From the Gerber site,
Features:
• Two piece toilet with Concealed Trapway for superior look with easy installation and cleaning
• Elongated Bowl (18 1/2") for optimal comfort
• Single flush 1.28 HET provides for maximum performance at optimal water savings
• Best in Class Fluidmaster Fill Valve and WDI 3” Flush Valve inside
• Front Mount Tank Lever Specifications: #20-832 (21-832 Bowl, 28-830 Tank)
• Color-match bolt cover plates included
http://www.gerberonline.com/downloads/specs/Toilet/20-832.pdf