I've been driving the IPace since 1 year now, and I never did it, and I would say that it is pretty accurate for me. I have about 400km with a full battery, 300km with 75%, 200km with 50%, etc... and I really drive about 100km when the battery goes from 100% to 75% and the GOM goes down by 100km. I would not want to fix anything if it is not broken for me.