Skipped both RAN chargers on our way home today...

[Dark-Fx]

Left Traverse City state park at 100% charge, 225 miles to home. Loaded R1S.

On the way up we stopped at the Clare RAN and had dinner at Culvers. Gave me an opportunity to stop and make sure my swing-arm wasn't having any issues. I think we ended up back to nearly 90% after 45 minutes. Was wondering if we actually needed to do it, but had planned to, so we did.

Weekend was successful. My 24A TT-30 wired OpenEVSE worked like a champ. I put a 30' long J1772 cord on it so we wouldn't have to worry about bringing an extension. I know the SAE wouldn't approve but technically extensions aren't allowed either.


All packed up and ready to head home.

Started off doing my typical 10 over but ended up settling at the speed limit as the estimated range left at arrival slowly went from 72 miles to single digits. Not really sure what the deal is, my R1T seemed to give way better estimates. But I've done the EV trip thing enough to know just to keep knocking speed off as the estimate drops.

We drove through Grayling past the RAN and still had 80% SoC left. Decided it wasn't worth stopping and just went for it.

Got home just in time. Lowest I've ever run any of my EVs before. Was nice not having to stop.

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[COdogman]

 

[rpo]

Roof rack/boxes and bikes on the back add a ton of drag that the Rivian won't adjust the range for (since it does not know they exist).

I remember reading a MPG test on a Prius about ten years ago where the most aerodynamic roof box available still lowered the MPG by 14 on the highway. It was a huge hit. I still think about it every time I see someone driving a Prius with a roof box.

 

[VSG]

Maverick? As in "I feel the need ... the need to slow down ..." ?

 

[s4wrxttcs]

I had a similar thing happen with my R1T where my estimated arrival range kept dropping. It went from a comfortable 60 to 30 or less so I kept slowing down until it stopped dropping.

I think it was wind causing the drop.

I wish Rivian would include expected wind on the initial estimate.

 

[zefram47]

Roof rack/boxes and bikes on the back add a ton of drag that the Rivian won't adjust the range for (since it does not know they exist).

The problem is that the truck knows what its current efficiency is, since last charge/past hour/etc. There's no reason why it shouldn't be able to use that knowledge and the known elevation changes on the route to better estimate range. Even without a route planned, it should use the known recent efficiency to augment the range remaining displays. But it doesn't...it relies on %SoC and a pre-calculated efficiency (mi/kWh) and refuses to show lower than that EPA amount.

 

[rpo]

The problem is that the truck knows what its current efficiency is, since last charge/past hour/etc. There's no reason why it shouldn't be able to use that knowledge and the known elevation changes on the route to better estimate range. Even without a route planned, it should use the known recent efficiency to augment the range remaining displays. But it doesn't...it relies on %SoC and a pre-calculated efficiency (mi/kWh) and refuses to show lower than that EPA amount.

That's how all EVs are when it comes to their range calculations. If they did that behind the scenes, then consumers would complain when their car showed 40% less range because they drove through some head winds on the prior trip.

 

[zefram47]

That's how all EVs are when it comes to their range calculations. If they did that behind the scenes, then consumers would complain when their car showed 40% less range because they drove through some head winds on the prior trip.

My Spark EV absolutely used current efficiency in its range numbers. Hell, they even showed a range on the GoM instead of a single number if you selected that mode so you could see what you'd expect if you drove like a hooligan or were driving Miss Daisy. The Bolt still has a similar display and it was fantastic.

 

[Andystroh]

That's how all EVs are when it comes to their range calculations. If they did that behind the scenes, then consumers would complain when their car showed 40% less range because they drove through some head winds on the prior trip.

This is actually how the ID.4 did it (I'm sure some others). Living in Colorado we would get some pretty comical range estimates depending on if we had been driving uphill or downhill over the past hour.

 

[Dark-Fx]

I had a similar thing happen with my R1T where my estimated arrival range kept dropping. It went from a comfortable 60 to 30 or less so I kept slowing down until it stopped dropping.

I think it was wind causing the drop.

I wish Rivian would include expected wind on the initial estimate.

There was definitely extra head wind for a good portion of the trip. And some rainy spots. Doubtful enough of either of those to knock 20% off of the total range though.

Still impressed we were able to make the whole trip without a stop all things considered.

 

[Ngkgb]

The problem is that the truck knows what its current efficiency is, since last charge/past hour/etc. There's no reason why it shouldn't be able to use that knowledge and the known elevation changes on the route to better estimate range. Even without a route planned, it should use the known recent efficiency to augment the range remaining displays. But it doesn't...it relies on %SoC and a pre-calculated efficiency (mi/kWh) and refuses to show lower than that EPA amount.

This is the real issue. So asanine. It makes no sense. Just confuses people, especially newbies to the EV game. I usually calculate SaoC by 2.5 for daily driving. Give myself more leeway for the highway.

 

[Dark-Fx]

That's how all EVs are when it comes to their range calculations. If they did that behind the scenes, then consumers would complain when their car showed 40% less range because they drove through some head winds on the prior trip.

GOM in my Bolt went from 265 miles displayed in early June to 105 miles in February. Pretty ridiculous difference but it reflected the reality of how much usable range there was based on recent history.

 

[Killer95Stang]

Between my personal inexperience with EVs and my wife in the passenger seat, I do not think I could have bypassed the second RAN stop.

 

[rpo]

GOM in my Bolt went from 265 miles displayed in early June to 105 miles in February. Pretty ridiculous difference but it reflected the reality of how much usable range there was based on recent history.

I actually have a Volt too, and it does a great job adjusting for temperature trends over about a two week cycle. 17 miles in winter and 35 miles in summer are the low/high points usually. But if I put a bike rack on the back and load up the car with a lot of weight and drive on the freeway, it does not adjust the range at all despite losing probably 20%. The Teslas that I have owned do not adjust whatsoever for the seasons. Not sure if Rivian does at this point.

 

[Dark-Fx]

I actually have a Volt too, and it does a great job adjusting for temperature trends over about a two week cycle. 17 miles in winter and 35 miles in summer are the low/high points usually. But if I put a bike rack on the back and load up the car with a lot of weight and drive on the freeway, it does not adjust the range at all despite losing probably 20%. The Teslas that I have owned do not adjust whatsoever for the seasons. Not sure if Rivian does at this point.

The Bolt wouldn't do it instantaneously, it was a reaction to the change in recent efficiency. My Rivian should have had the 225 miles going up to figure out that what the average efficiency for the next trip might be. The Bolt would have made the adjustment after that many miles.

I suspect Rivian does have a certain accommodation in the range calculations, but just not enough. The R1S said 339 miles on the dash but estimated we'd get home with 72 left after 225 miles. I swear doing a similar trip in my R1T that the number remaining was regularly pretty close, but maybe we were just getting lucky with the wind direction.

Of course this could just be another regression bug since I swear last year my R1T would actually adjust the arrival number down on the map matching the real world consumption. Of course that number was always based off the theoretical rating that has no basis in recent consumption.

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