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Was that an AC charger ? What sort of charge rate did you get?I’ve driven that same route, in both directions, many times, in both a Roadster (back in 2011-2012..) and a Model S. The Roadster had half the battery capacity and 50% worse Cd, so the energy drain was much more noticeable than in an MS. Before Superchargers there was a UK HPC / High Power Charger network for Roadsters, and Tebay had one!
The most important thing to bear in mind is that the M6 from Gretna to Tebay gently rises just over 1,050 ft / 320m reaching a peak just before J39 / M6 / Shap turn-off .. which also happens to be the highest section of motorway anywhere in the UK!
The extra energy required to haul the M3 up that very long slope, in addition to just normal cruising on the level, can be calculated from bog standard O level maths. At the Shap summit the potential energy the car has gained has to come from somewhere, namely the battery, and the simple equation for PE = Mass X Elevation-change X Gravity-constant. So, to haul a 2,000kg car up a gradual 330m high slope, and allowing for a mere 15% loss due to inefficiencies, requires approx 7.5mj of energy, or approx 2kWh beyond the normal energy for driving economically on the flat. That 2kWh equates to about 8-10 miles loss of range if driving 50mph. A modest head wind of just 10mph over 40+ miles will also cost the best part of 2kWh as well, so call it approx 4kWh total, and this helps explain 15-20 mile loss of range beyond normal eco cruising at 50mph.
Obviously there are many other factors that could be considered, but hope this helps provide an explanation.
Here's a gratuitous photo taken at Tebay, from about 9 yrs ago, showing the forerunner to Superchargers !
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No I wasn't. As I had gone beyond the point of no return (Gretna Services) I was accepting my fate at this stage and to be honest it never even occurred to me to look at the energy graph.
I thought the navigation system did take into account elevation, or is that just ABR? Generally my % at arrival figure is absolutely bang on.
Ah right. If the car does not know where it's going then it is unable to provide an accurate prediction of consumption. This is a route with very significant gradient changes yet the predictions you were getting were based on the default "ideal" driving conditions. You absolutely have to set the destination and use the energy graph (or use ABRP) to get a reasonably accurate prediction. Battery calibration may be an element but I don't believe that was the main culprit. If your S experiences were over more moderate terrain then maybe you could "get away with" just following the miles remaining.
I was using the navigation. As I mentioned in the opening post, it was nagging me to charge at Gretna...and as I mentioned this was my grave error
'Back in my day.....'
Gosh makes all the moaning we hear about SCs now seem rather trivial. Do you still have the Roadster? In a different life without family responsibilities I would truly love to own one!
Thanks for the explanation which helps to explain the miles evaporating. Even better the photos and the insight into those of you who were there in the earliest days of Tesla.
Was that an AC charger ? What sort of charge rate did you get?
As far as I know, I was one of about 20 UK owners, although most of them seem to wrap them in cottonwool.
Blimey, you like to live on the edge!I was using the navigation. As I mentioned in the opening post, it was nagging me to charge at Gretna...and as I mentioned this was my grave error.
I have checked the altitiude graph this morning on ABRP (see image) showing the journey from Scotland to Tebay services. As you can see the blue dot represents Gretna, and from there there it is pretty much constant uphill for most of the journey, except the very steep downhill for last 2 miles hurrah. Several others have also made this point about the long uphill stretch.View attachment 574818
I noticed during the trip that the M3P navigation display does NOT show arrival percentage. Bit irritating I thought and so this contributed to the problem and it diverted my reliance more to just the "miles remaining" statistic.
Exactly. If I drove the M3P day to day I might have known this. Plus it literally being 3 months old and (virtually) never driven. Biggest factor of all of course my own complacencyThe M3 does do this, if you either tap on the style of satnav on the top left of the screen, one of the modes is the entire route which shows the estimated state of charge at the end of the journey or if you did a round trip back to your current point. It will also do this if you drag down on the little tab under the satnav destination to the right of the mapping screen.
Couldn’t agree more.I think it’s a shame that the trip consumption graph is hidden away in the menus and to bring it up obscures the navigation.
From a UI perspective it would be nice to be able to see both.
I noticed during the trip that the M3P navigation display does NOT show arrival percentage.
Forget about charging your car. From the first screenshot I'm really concerned that your phone is going to run out of batteryI was using the navigation. As I mentioned in the opening post, it was nagging me to charge at Gretna...and as I mentioned this was my grave error.
I have checked the altitiude graph this morning on ABRP (see image) showing the journey from Scotland to Tebay services. As you can see the blue dot represents Gretna, and from there there it is pretty much constant uphill for most of the journey, except the very steep downhill for last 2 miles hurrah. Several others have also made this point about the long uphill stretch.View attachment 574818