Jomarkh
Distinguished Member
- Joined
- Apr 5, 2021
- Messages
- 3,878
- Reaction score
- 2,439
- Points
- 1,032
- Location
- Southampton
- Driving
- MG5 Excite
My rate was 4.2 but has gone done to 3.9 in the last few weeks
It is not an exact science. There are too many factors for a short journey to accurately measure. For instance, drawing current will heat the battery, as the battery heats the internal resistance drops and the battery can more easily deliver power, improving efficiency, so efficiency will improve. However temperature will also increase the voltage so if it is trying to use the voltage drop to measure the kWH used then as it heats it will think it has used less capacity. Voltage drop is non-linear in relation to the remaining kWH so it is not a easy gauge anyway. But then I had a car where the fuel tank stayed on maximum for roughly 60% of the miles, then dropped rapidly until the fuel light lit with about 80% of the tank used. It was a small tank so I had to try to remember to set the trip meter to avoid sudden fuel stops.I have had my 5 for 3 months now (Standard range Excite). The first 3 months have worked out at 4.6 mpkwh overall (according to the screen), but so far I have driven only 1000 miles in total. However, I am puzzled by the fact that individual journeys register about 4 to 4.2 mpkwh. I assume that this is because I am making quite short journeys , typically about 10 miles or so (Isle of Wight remember), and this leads to an underestimate on individual trips. Can anyone confirm that this is so? When I have managed a slightly longer trip and got up to about 20 miles then 4.5 ish seems to be the order of the day. The temperature over these past 3 months has been good overall, typically in the teens and twenties. However, I have noticed in the last 2 days, when there has been frost on the car and the air temperature has been as low as 3 degrees, that a 10 mile journey which has typically been around 4 mpkwh has dropped to 3.5. This was with lights on and more use of the AC. I assume that this is the shape of things to come over the winter. It will be interesting to monitor and see what effect this has on the overall figure. I won't reset for now, I want to see what happens over a whole 12 month period. Interesting stuff I think.
HiLove to know how many miles are getting per kWh... I have only had my 5 for 2 weeks now so wondering what average I should be looking at once I've done a few more miles
This is a fascinating subject - I will enjoy exploring it over the winter.It is not an exact science. There are too many factors for a short journey to accurately measure. For instance, drawing current will heat the battery, as the battery heats the internal resistance drops and the battery can more easily deliver power, improving efficiency, so efficiency will improve. However temperature will also increase the voltage so if it is trying to use the voltage drop to measure the kWH used then as it heats it will think it has used less capacity. Voltage drop is non-linear in relation to the remaining kWH so it is not a easy gauge anyway. But then I had a car where the fuel tank stayed on maximum for roughly 60% of the miles, then dropped rapidly until the fuel light lit with about 80% of the tank used. It was a small tank so I had to try to remember to set the trip meter to avoid sudden fuel stops.
I got 3.4m/kw over my first 1500m, half of it on motorways.Love to know how many miles are getting per kWh... I have only had my 5 for 2 weeks now so wondering what average I should be looking at once I've done a few more miles
That's pretty low for summer months are u in eco or sport modeover 6000 miles 3.7 miles per Kwh
One day I went out for a ride and got it up to 6.3 for a whileThat's pretty low for summer months are u in eco or sport mode