i have a 99 vt i easily get 800 plus km out of a tank i was towing a trailer and now my trip commputer is playing up. Its not reading the correct km left and i have to disconect the battery for it to read true and it will chew through the fuel like im still towing if i dont disconect the battery. has anyone had this problem and if so could u pls let me know how it can be fixed