And it runs on a similar Honda PGM-Fi setup :) If a 223 Fi engine can go about 40-42, why can't a 250 give 35-38? Point to ponder you see :)
ZMR is a 223cc engine producing only 17.5BHP where as CBR producec 25bhp ,ZMR is light in wight (2kgs ) , tires size is also less (100/90 rear and 80-100 front) comparing to CBR (110/80 Front and 140/70 rear) . Only plus point for CBR is that its bit more Aerodynamic than ZMR that's it. There are hardly any similarities in Engine and compression ratio of both bikes. So above points do give an EDGE to zmr when comparing FE of both bike.
I never got less than 32kmpl on highway at speeds 90-110kmph or 28kmpl in bumper to bumper traffic on my CBR.