well i believe i sold my 2000 merc 225 efi. have purchased a 2006 mercury 225 optimax 97 hours with factory warranty due to the fact it was purchased in 2008. also the motor hasnt been registered with merury yet? looking for the fuel mileage increase. hope its a good motor. im aware that it is really important to warm them up and only use optimax oil. any thought would e appreciated. what about speed and bottom end grunt?