Doesn't really effect my range as it depends which level of assist your using.my 625 battery on mtb Road rides can still get me 65 miles range and I'm 19 stone. My road bike ep8 motor with 500 battery only gets around 30 miles.
Hi tried chips etc but best thing by miles is the part you fit to rear disc.lets assist increase to approx 23mph and no cables or software required.attachment provided shows the site.