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Motors specs are the same per the EPA certification.
Page 4 of 31 (per the footnote, not the pdf page number) shows curb weight of the 2022 Model Y AWD as 4356 and 4381 for Model Y Long Range AWD. So there is a 25# weight savings. Front megacast weight savings?
Based on the 91 kWh recharge event to 79 kWh usable, the 76 kWh recharge event would be 66 kWh usable, maybe 70 kWh total. Unless the 91 kWh recharge events are false (15% charging loss seems very high at 208V). Like maybe they had a VW like cheat in the system when you enter testing mode to burn off excess charge energy so when they measure wh/mile and multiply by charge amount it gives a longer range? If they were getting 280 miles off a 70kWh battery with 66kWh usable with 2170 or 4680, it would seem the weight savings would be a lot more. Unless it was a LFP pack. Seems about right for the extra weight needed for LFP vs NCA but needing larger space for less energy dense battery. But this introduction paragraph would say otherwise (unless it is a copy over they didn't change regarding chemistry):
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All this is a bit confusing but doesn't really point to a certain thing that changed. Both the original doc from 10/21/21 and this new one from 2/22/22 list LR MY AWD volts as 360, battery specific energy as 180 (no units) and battery energy capacity as 235 (also no units). If you attach amp hours to the battery energy capacity and multiply by volts you get watt hours so 235 x 360 = 84,600 Wh or 84.6 kWh. With this number, the 76 kWh recharge events on this new variant seem more likely than the 91 kWh ones before. But would mean a much higher battery buffer than we have seen in the real world. Still perplexing that we see 15% less range and supposedly same battery chemistry, energy and energy capacity listed in the documentation as prior versions, just different recharge event kWh.