Tesla Model S P85D Versus P85 – Efficiency Test Video

FEB 19 2015 BY MARK KANE 9

Tesla Model S P85D vs P85 - Efficiency Test, Take 2, Leg 1 (5x Time Lapse)

Tesla Model S P85D vs P85 – Efficiency Test, Take 2, Leg 1 (5x Time Lapse)

Jason Hughes released this month his second video from efficiency tests of Tesla P85D and P85.

In the first one, the P85D with firmware v6.0 2.0.81 was ~16% less efficient than the P85.

Now. with firmware v6.1 2.2.140, it seems that the efficiency results between the two cars are similar. The reason is sleep mode for one of the motors at lower loads.

Final results!

P85: 111.3 miles, 35.0 kWh, 315 Wh/mi
P85D: 112.3 miles, 35.4 kWh, 316 Wh/mi

For comparison, the results of the previous test (pre-torque sleep) were:
P85: 111.3 miles, 34.1 kWh, 306 Wh/mi
P85D: 112.2 miles, 39.5 kWh, 352 Wh/mi”

“Leg 1 of my second efficiency test of my new P85D (firmware v6.1 2.2.140) and a P85 on the same route, at the same time, at roughly the same speeds.

The previous test on older firmware can be found here: https://www.youtube.com/watch?v=Ndxjt2f2Tf8

Detailed information on this run can be found here: http://www.teslamotorsclub.com/showthread.php/42134-P85D-vs-P85-Efficiency-Testing-Take-2?p=897458&viewfull=1#post897458

Sorry for the shaking of the dash videos. The GoPro mount bounced/vibrated a bit on the trip. The dash videos are also perspective corrected so the dash looks straight on (the GoPros were mounted to the left side of the dash looking at it on an angle)

This was immediately after Tesla pushed the first “torque sleep” update to the P85D. The P85 and P85D are nearly identical in energy usage now.”

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9 Comments on "Tesla Model S P85D Versus P85 – Efficiency Test Video"

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CherylG's_DirtyLittleSecret

That’s pretty good real life data.
Small sample but probably fairly accurate.

Okay, I’m confused. I thought the consensus was, in the discussion on the Tesla Motors Club forum, that the dual-motor “D” version had a net higher efficiency.

Perhaps there is variability based on such factors as average driving speed, highway driving vs. in-town, stop-and-go driving, etc?

As noted in the comment above, it’s a small sample size, so I’m not sure how meaningful this is.

I think in stop and go the Model D is more efficient

The 85d is more efficient (same front motor smaller rear motor) the p85d initially was worse. The 85d has the advantage of choosing a small motor when it’s more efficient.

Identical conditions. So a good test.

I believe I am getting about 2-4% BETTER efficiency at freeway/highway cruise in my P85D with the sleep software compared to my earlier 85S model single motor car on the same highway conditions.

I am a bit shocked that in the above video “experiment” the P85D did not record much better highway efficiency readings than the earlier P85 car. Again samples of n=1 of each model and different, and individual drivers, so acceleration at each stop and any delta of cruise speed at highway driving MIGHT have impacted these video reports.

But the CLEAR CONCLUSION is that the latest “sleep mode” software greatly reduces power draw a cruising speeds. No arguments there.

I’d like to see the non perf version. Model s85d vs s85… especially post sleep update.

Re: Okay, I’m confused. I thought…

Title: Driving Range for the Model S Family
http://www.teslamotors.com/blog/driving-range-model-s-family

Range chart: http://i.imgur.com/IaBzok3.png
“At some speeds the P85D is more efficient than the base 85 and equivalent to the 85D. At other, higher speeds the 85D and 85 are slightly more efficient, with higher range, than the P85D.”

Thank you, scottf200.

I thought the following article, previously posted at InsideEVs, was definitive on the subject, but I guess it’s not that simple:

http://insideevs.com/official-epa-figures-reveal-tesla-model-s-85d-new-range-king/