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Wh/mi while drafting?

Discussion in 'Model S' started by Krebnarb, Jul 17, 2016.

  1. Krebnarb

    Krebnarb Member

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    Boston, MA
    Week 2 w/ the new 90D. This weekend driving back from Maine to Boston, I decided to try drafting behind a semi on AP, with distance set to 4 on the highway going ~65 mph. Was able to hit 221 Wh/mi averaged over 30 miles. Then the semi turned off an exit, and I monitored Wh/h, trying to maintain the same speed an it crept up to ~265-270 Wh/mi. I knew that drafting definitely increases efficiency, but was cool to see it working first-hand. Curious what experiences others may have had trying this


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  2. kirkbauer

    kirkbauer Member

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    Honestly I thought you had to be closer than that to have any effect so it is interesting to see your numbers.
     
  3. Logan5

    Logan5 Member

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    A slipstreaming or platooning mode would be a cool upgrade to AP. It wouldn't be hard to imagine the AP technology to be extended in such a way that a group of Tesla's going to similar destinations on the highway could line up with distances between them automatically adjusted according to speed in order to take full advantage of aerodynamics to save energy. It also wouldn't be a stretch to imagine AP adjusting the cars distance to improve energy use based upon the size a truck it was targeted to slipstream behind.
     
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  4. rickrickrick

    rickrickrick Member

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    I worry about rocks :eek:
     
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  5. kort677

    kort677 Active Member

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    I drafted this winter heading west on I 70 into strong headwinds, 20f temps and a few hundred mile upgrade I guess it decreased my energy usage by more than 25%. 3-4 lengths back is close enough to see significant gains.
     
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  6. James Anders

    James Anders Member

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    That was my thought too. Beside the safety issue with getting closer - I would be worried about stone chips and rocks cracking windshield. For what? To save a few kWs?
     
  7. Krebnarb

    Krebnarb Member

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    I also had a concern about rocks, which is why I tried to stay at least 4 car lengths behind. I was pleasantly surprised at the result, as I also thought you needed to be much closer! I'll try it at 5 or 6 next time and see what impact that has. Man I love this car!
     
  8. ZeroDarkSilver

    ZeroDarkSilver HEPA cleaning your atmosphere, you're welcome

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  9. bkp_duke

    bkp_duke Member

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    This. You do this frequently, you should expect a much higher rate of rock chip damage to your car.
     

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