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M3P - first long drive.

Adopado

Well-Known Member
Aug 19, 2019
6,802
5,421
Scotland
Efficiency on my return journey was better than on outward journey. I do not recall any significant changes on both trips (apart from the car was an extra passenger heavier on a way back). Could charging at slow speed at home result in a low battery trip life compared to charging at Supercharger? If relevant, my lifetime data: 3,888 miles; 1,542 kWh; 397 Wh/mi

The things that make a difference for return journey would be weather (wind direction or significant rain) or journeys in hilly areas where you are doing a lot of uphill one way and downhill the other way. Your overall average Wh/mile is certainly high so maybe that includes quite a bit of early days sporty driving!
 
I've now driven 14,767 miles in my MP3 since 30/09/19. My lifetime is 320 Wh/Mi but approx 2/3 of my total mileage was completed over the colder first 6 months from Oct'19 to March'20. Since March '20 lockdown, I've driven approx 5,000 miles, mostly last summer/autumn and this spring.

Last Saturday, I completed a round trip of 420 miles, using 113 kw/h and averaging 270 Wh/Mi. This was predominately relaxed motorway driving at 70 mph, same day, 12-14'c with a some light rain on the return. The OPs Wh/Mi lifetime average is indeed very high - though some of that will be reflective of the time of year those miles were driven (from Sept'20), short journeys do hurt consumption and perhaps some enthusiastic driving, as others have commented.
 
A few weeks back I did a road trip that took in Nevis, Scafell & Snowdon from West London and averaged 271Wh/mi over the 1,316 miles. Due to the length of the trip I also went speed limit plus 10% whenever possible. Mainly National speed limit roads.

As per other comments use % for current battery and the very reliable consumption graph for estimating arrival battery %.
 

J1mbo

Active Member
Aug 20, 2013
1,609
1,460
UK
I have a ~200mile (each way) motorway trip that I do quite often in my M3P. My usual rule of thumb for range in miles is simply this: battery % x 2.

As a typical full charge will give me 220 miles, so that means an average buffer of around 20 miles range from a full charge, assuming no long stops where the battery will cool down.

Lifetime is 389, because most driving since getting the car has been short local trips.
 
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mswlogo

Well-Known Member
Aug 27, 2018
8,408
7,952
MA, NH
397Wh/mi lifetime average is really high. I'm curious what was your trip consumption average. Did you happen to reset a trip meter prior to the drive? IIRC, my Wh/mi consumption was "only" ~320 with 4 people, full trunk, HVAC on, and cruising at ~75MPH on a long distance trip.

I agree, that’s ridiculously high. My Model X is 306 wh/mi lifetime (which includes towing). My Model 3 was like 240-250 lifetime. 230 in the summer.
 
Thank you Everyone for kind contribution! I have learnt that:
1) yes my consumption was higher than usual but not shocking to most of you (so it is a relief for me!);
2) many factors I have not considered especially the speed (on my way back after the second charge I felt a bit more "adventurous" and at some point I did get a warning message to keep speed under 85 if I still wish to reach my destination w/o re-charge); I really did not think that the 70 to 80 mph difference is so noticeable for battery consumption (as you know it is certainly not noticeable when motorway driving);
3) thank you GriLLA for TeslaFi and manual calculation example!
 
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Adopado

Well-Known Member
Aug 19, 2019
6,802
5,421
Scotland
Thank you Everyone for kind contribution! I have learnt that:
1) yes my consumption was higher than usual but not shocking to most of you (so it is a relief for me!);
2) many factors I have not considered especially the speed (on my way back after the second charge I felt a bit more "adventurous" and at some point I did get a warning message to keep speed under 85 if I still wish to reach my destination w/o re-charge); I really did not think that the 70 to 80 mph difference is so noticeable for battery consumption (as you know it is certainly not noticeable when motorway driving);
3) thank you GriLLA for TeslaFi and manual calculation example!
The 80/90 is massively less efficient than 70mph. There’s your answer! At least you know it’s not the car playing up.
 
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There's a square relationship between speed and energy so @70mph = 4900units @90mph = 8100units or 65% more.
You got to love these environmentally friendly cars that encourage folk to burn through the watts..:eek:
There’s a square relationship between speed and air resistance, but that’s only one part of the energy usage picture. There’s no doubt that energy usage goes up significantly with speed but in reality I don’t think the mileage impact is even inversely proportional never mind squared.
 

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