Chesty morgan :
ATC Watcher, on the EMB 195 the penalty for flying 2000' lower is somewhere between 200 and 300kgs, obviously dependant on route length.
I am not familiar with the EMB195 but I doubt very much your figures, if 20 min at 2000ft below optimum = 200 Kg that would be 10Kg/min ???? Common !!
Look afain your charts, I think you got a zero wrong somewhere.