South: Glasgow to Oxford, 3 stops North: Oxford to Glasgow, 2 stops
Mid-November 2017, after six weeks of pottering around our local area in our new BMW i3 REX, we set off for Oxford. Big adventure.
I’d been getting 125-130 miles in the city with the advantage of regeneration charging when slowing down at lights, etc. This is one of the nice bits of electric driving. When you take your foot off the accelerator, the car responds as if you’ve used the brake and starts to slow down. Then it gets clever and converts some of the ‘braking’ energy into electric current which is fed back into recharging the battery. Basically driving an EV car means that you hardly ever use the actual brakes! But motorway driving doesn’t produce much in the way of regeneration since you’re mostly driving at constant speed. And it was November, so getting colder, which also cuts back on the range. So all a bit unknown…. this is what happened:
We always stop twice on this journey whatever type of car we’re driving. But it took longer than it would have done in a petrol car. Especially going home where we wasted about 90 minutes because of chargers delivering a very low charge and me not noticing.
I was disappointed that the battery range was only 107 miles. I was expecting something more like 115-120 miles. But that expectation may have been naive given that it’s all motorway driving and it was November, both of which reduce the range. The 107 range was pretty much constant for motorway driving. My days of whizzing along in the fast lane at more than the speed limit are long gone. I mostly drive at about 65mph. Be interesting to see what the range is like when we’re down again in the summer. Certainly without REX the journey would have taken much longer and been more stressful.
REX stands for Range Extender. BMW offer an i3 REX which adds another 60-90 miles to the driving range. That’s the upside. The downside is that it involves using a small petrol-driven internal combustion engine which produces electricity and keeps the battery topped up. So I’m burning petrol when I’m using it 🙁 For normal car use, I never have to use REX but as you can see from the journey details above, I resorted to it quite a lot. I reckon in the overall journey of 760 miles, we used REX for 180 miles, so about 25%.
One reason for resorting to REX was the reduced battery range of just 107 miles. The other reason was faulty chargers. In this case they were all Ecotricity chargers. We suffered more than we needed to because of my inexperience though. Next time I won’t be relying on an app to tell me that everything fine, I’ll either be sitting in the car or I’ll be popping out from the cafe to check.
My memory of the trip is how great a car it is to drive but mixed with general anxiety of doing our first long EV trip and the additional specific frustrations of the chargers. But it is interesting seeing the maps which I’ve put together for this post. I look at them and think wow, that was pretty good!
You live and learn!! 🤪 🤪