Range depends on quite a few factors, speed and use of the AC to name but two. When I had a Gen1 model it did not have the new BMS update which reduced estimated mileage to 163, so the estimated range was around 178 in mild to good weather and down to around 155 in poor weather. One very important thing on maintaining battery health is re-balancing. If it has not been re-balanced for quite some time then if I remember correctly the battery has to go through multiple rebalancing cycles to normalise itself. I’m sure someone better than me can advise on this if I am wrong.
I used to do a round trip of c100 miles in my Gen1 of which around 36 was on the motorway. I drove about 60mph, sometimes a bit more but not often. You soon get used to people driving slower than that! I installed Autoclover wind deflectors to try and minimise use of the aircon to demist the windscreen in cold and wet weather (I currently also use the shaving foam method too, because range is important to me). Some time ago a member created a very useful list of things to think about to maximise range. I’ll see if I can find it and create a link to it.
Generally speaking, when checking EV mileage to actual mileage, then depending on the weather and adopting some general principles on how the car is used, I would be either 10% up or down.
www.mgevs.com
