UM Nitrox vs Yamaha Ray ZR:
UM Nitrox is priced at Tk 0 while Yamaha Ray ZR is the costlier one priced at Tk 165000.
UM Nitrox brand origin is USA and Yamaha Ray ZR brand origin is Japan.
Yamaha Ray ZR is the more fuel efficient one with a claimed mileage of 66 kmpl while the claimed figure for UM Nitrox is 45 Kmpl.