R2 Highway Efficiency Test: 80 MPH vs 70 MPH Changed Everything

[Universe93B]

Yes, but that is only ~75 miles to South Hill. To Petersburg it's ~125 miles where I-85 ends and it slows down before that anyways. R2 has a 250-300 mile range. So the point was no one is averaging 80 mph straight for that long unless they're on a desert trek out west or something. Averaging 70 mph is far more likely, which is why a 70 mph range test is key and applicable to everyone's real world use.

I do a round trip on the same day, traveling back in the evening for a business and work. I wish EVs are better at constant speeds around 75-80mph.

I think you are defending EVs and the R2 a little too much. I think it’s better to acknowledge this issue in EVs in the current state if we want EVs to compete better with ICE.

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[SANZC02]

Worth noting, the drop in efficiency is related to drag not the speed. If you are on a busy highway and are not in the lead vehicle the drop off doing 75-80 is not as bad.

It is when you are the pace setter that you really see the drop off.

In my R1S 75 is not horrible but on the highways that have an 80 mph limit I tend to do 75-78, that extra few mph over seems to be a really big hit on efficiency. My last trip around 7k doing posted speed limit with the above exception I averaged 2.25 m/kWh. My guess is the R2 will be closer to my older Model S at just under

 

[Jeremy3292]

I do a round trip on the same day, traveling back in the evening for a business and work. I wish EVs are better at constant speeds around 75-80mph.

I think you are defending EVs and the R2 a little too much. I think it’s better to acknowledge this issue in EVs in the current state if we want EVs to compete better with ICE.

Sure, but then you just charge at home after ~150 miles so it's a non issue? I'm not defending anything; I've long been on the record here a ~100 kWh (vs. 88) battery R2 would've been great. I'm just pointing out a lot of people oversell how much range is needed in their daily life or even road trips. I have no issues with bigger batteries and farther range though.

 

[mcdaniken]

I may have one of the few vehicles on the planet that gets better fuel economy at 80 mph than it does at 70 mph. My Jeep Renegade has a 9th gear that won't kick in below about 80 mph. So i get about 22 mpg historically at 70 mph, and 25 mpg at 80 mph.

 

[zefram47]

Noting that Air is 14% less dense at 5,000 ft than Sea Level. That translates into about an 8% benefit at high altitude at 75 mph (depending on vehicle). Beware colorado 70 mph range tests!

Air at 32F is also 15% more dense than air at 70F for the same elevation. The difference between 70F and 100F is 5% lower density at 100F.

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