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Guessing 313. Most of when we were driving the Hummer at 70 mph was in sub-freezing temps and it'd still get maybe 280 miles of range from 100% to 0%. Otherwise I drove 10 over on our trip, which was more like 250-275 miles of range in warm weather.

If he's in Ypsilanti, we've had shit weather here the last few days so it's going to definitely impact the range.
 

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313 would be a strong number, that is lass than 10% off mixed driving rating.
Back in early march we did 240 miles at the speed limit on 89% of the battery. Below freezing the whole time and actively snowing at times. 313 miles would be mean the 240 miles was about a 15% loss of range due to those conditions vs optimal.
 

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@Tom E-Tron: I concur. My range modeling software says 297 miles @ 70 deg. F/sea level. See below. That will probably be Tom Malough's. When Kyle Connor does it, driving from mile-high Ft Collins, the spreadsheet suggests he'll probably do an "amazing" 330 miles.

Note also that at 80 mph, it shows about 257 miles, fitting with @Dark-Fx 's 250-275 trip result.
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What are you using as battery capacity? My truck was reporting over 214kWh. Our first real big drain of the battery was in below freezing weather, calculated out around there as well. I'm not sure if Ultium reports a lower capacity in cold weather but my Bolt would report about a 5% capacity loss just because of the cold that would come back in the summer.
 

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I just visited that station's Plugshare page. All kinds of recent checkins by Rivians, BMW i4's, etc. that have full 500 amp charging capacity reporting 200 kW or more charging without apparent issues. Granted, they are 400-volt architecture, not 800 volt, but if there are electronics/handle/cable heating issues, its the amps that create the heat, not the volts. I suspect it was not an EA problem. This is in the vehicle.

Tom's test is, at the minimum, a major GM PR fail, if not a technical fail. GM has had the chance for months to act proactively and provide real-world demonstrations of the Hummer's and Lyriq's best charging speeds. GM has made several significant claims for charging speeds, including that the Hummer will add 100 miles in 10 minutes. But they should know that demonstrating really, really good speeds on their first Ultium-based vehicles is critically important to launching ALL their new EV's, including Lyriq, Silverado, Blazer, and Equinox. Words don't get you back on the road in a timely manner. The biggest single non-pack-fire-related criticism of the otherwise very-successful Bolt was its slow charging speed. The market will not tolerate anything hinting of slow speeds from GM's new EV line. The fact one of the most knowledgeable fast-charging consultants in the world, using what is supposed to be one of the best charging systems in the US, could not get a successful session of GM's first Ultium-based EV out-of-the-box looks really bad.
The charger is in GM's neighborhood. If it was going to have issues, they would have warned Tom to not charge there.
 
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