Difference between GOM & web-based carwings (N.Leaf)

isnottheword

I'm seeing a disparity of 3kWh/100km between the fuel efficiency figures on carwings website vs. the GOM/dash display. Can I assume the carwings figure is more accurate? It's the one that's showing greater efficiency.

unkel

As per the forever re-occurring thread in motors (ICE motors) - measure distance (odo) and measure consumption (fast charger or at home if you can). Both are accurate. So then you will know. All other displays of fuel consumption can be presumed to be not very accurate.

Calahonda52

The only number I am interested in is how far I can get at a specific speed with a specific value on the GOM given the driving conditions so kWh/100km is largely irrelevant to me.
I think, in my car, at 93km/hr in daylight with ambient temp at 11 degrees C and no wind and flat roads, my available kms as per the GOM decline at the same rate as the kms tick down on the sat nav: whether that is 16kWh/100km or whatever is largely useless to me.

I was down in Carlow on Saturday night and with extra passengers and lights on it was less than 93 km/hr so I slipstreamed 15km on the Nass dual carriageway.I left with 115 on GOM to drive 100 km and drove at 93.
I was even steven at Naas, hence the slipstream rather than stop!

zilog_jones

Knowing your average consumption at certain speeds can be useful for predicting range for certain journey, e.g. if do x kWh/100km at y average speed then you could do z km. The GOM can't predict the future, especially if you're doing some drive that you don't normally do.

It's also useful for calculating costs, as it's easy to convert kWh/100km to EUR/100km and compare with other cars.

Gumbo

I ignore the GOM to a large extent. I run off my battery % figure as I know how much I need to get to work, home from work. How many KM does each % use at different speeds on motorway etc

BoatMad

kceire wrote: »

I ignore the GOM to a large extent. I run off my battery % figure as I know how much I need to get to work, home from work. How many KM does each % use at different speeds on motorway etc

I use rather complicated estimation strategy , in that I compare the rate of reduction of GPS distance to the rate of reduction of the GOM.

The nett result is you retain a difference figure in your head

so if I start out and I have 150 on the GOM, and actual of 100 km , as I drive along I track how much of the 50 km Im losing at any given stage , if I approach a 30 km difference, unless I know the route , I will then always assume I will be too tight to make the destination and start factoring in my ( predetermined ) charger options

I also find the following true as a rule of thumb

1 power dot GOM betters GPS
2 power dots ( and under 100 km/h) GOM matches GPS
3 power dots GOM looses ground to GPS, at around 2 km a minute
4 power dots , start looking for chargers !!

In that regard I now can " correct " the worst excesses of the GOM

cros13

On the i3, provided you set a destination it recalculates the estimated range depending on speed limits, topography and historical journeys from other i3s.

So it's pretty much dead on.

The Leaf is a whole other story. You can't even trust the SoC display.

BoatMad

cros13 wrote: »

On the i3, provided you set a destination it recalculates the estimated range depending on speed limits, topography and historical journeys from other i3s.

So it's pretty much dead on.

The Leaf is a whole other story. You can't even trust the SoC display.

The leaf is certainly very subjective , The maps have no topology information anyway so thats out

The GOM could be a whole lot better all right , given the safety margins you end up leaving up knock 20% of the usable range in practice

isnottheword

isnottheword wrote: »

I'm seeing a disparity of 3kWh/100km between the fuel efficiency figures on carwings website vs. the GOM/dash display. Can I assume the carwings figure is more accurate? It's the one that's showing greater efficiency.

Are you looking at the total average on carwings or the trip average ?

I find it matches perfectly the trip reading. The total average is calculate out over a much longer time and will not be the same as trip averages.

BoatMad

unkel wrote: »

As per the forever re-occurring thread in motors (ICE motors) - measure distance (odo) and measure consumption (fast charger or at home if you can). Both are accurate. So then you will know. All other displays of fuel consumption can be presumed to be not very accurate.

Yes but that's a rather post journey analysis. You can't do it for a route that you haven't already taken

What you calculate is kWh per 100 km , which isn't any use in new journeys

Calahonda52

BoatMad wrote: »

I use rather complicated estimation strategy , in that I compare the rate of reduction of GPS distance to the rate of reduction of the GOM.

Thats what I have got to as well.
Its not complicated as its just subtraction.