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Range data from removing Aero Wheel Covers

Ferdball

Member
Oct 9, 2014
12
40
San Diego
TL DR; 16.7% increase in Wh/mile with aero wheel covers off.

ML ND; 54 mile drive: 4 miles of surface streets, 50 miles freeway. Freeway speed was between 75 and 85. Similar driving style.
 

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Moderatefan

Member
Dec 20, 2017
902
841
Denver, CO
Something is not right here. We had someone do the comparison before and it was around 5% difference on 18 inch rims if covers were off.
If you go from 18 inch to 19 inch, that's another 5% (worse for 19)
 
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jsmay311

Active Member
Apr 22, 2016
1,179
1,695
Chicago suburbs
Seems way too high to me. More details are in order.

Highway speeds were 75-85 mph? What does that mean exactly? Were the speeds identical on both runs out not?

Were the two runs done right after each other to ensure similar temps and winds?

Did each run stop/start at the same location to minimize effects from changes in elevation and wind direction?

Was climate control turned off?

Etc. Etc. Etc.

(Also, what is ML ND?)
 
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Ferdball

Member
Oct 9, 2014
12
40
San Diego
My experience is my experience, obviously. Your mileage may vary.

That being said, I have driven the same route to work for 16 days. Each time was a consistent 240 ish Wh/m. Again, it’s not scientific, but I feel it’s a consistent data point.

I’ve only driven once without the covers, but that is a significant change. Also, I did not hoondog it and Otto was my pilot.
 

T34ME

Active Member
Mar 31, 2016
2,262
3,528
Inland Empire
Something is not right here. We had someone do the comparison before and it was around 5% difference on 18 inch rims if covers were off.
If you go from 18 inch to 19 inch, that's another 5% (worse for 19)
Those numbers came from Tesla. I believe they measure efficiency at either 60 or 65 mph. The OP measured at 70/75 mph.
 

SageBrush

REJECT Fascism
May 7, 2015
12,508
15,528
New Mexico
Highway speeds were 75-85 mph? What does that mean exactly? Were the speeds identical on both runs out not?
This caught my eye too. Unless OP adds more detail to convince me otherwise it sounds like the test runs had too much variation to give a valid comparison.

That said, 244 Wh/mile at 75-85 mph is tremendous.
 

SoCalGuy

Active Member
Apr 22, 2012
1,416
1,095
So Cal & New York, NY
I drove 200 miles in a recent M3 build with mostly highway driving (prob 80%) and got 227 wh/mile on the 18s without the aero caps on a sunny day with temps in the high 50s/low 60s. Highway speeds generally between 60-70 mph since speed limit in tri state around 55 mph.
 

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