https://electrek.co/2023/12/05/epa-c...ybertruck-r1t/
One of the best quotes from this article
"Tesla already has a reputation for using rather high correction factors to publicize better range that its EVs usually offer – and the Cybertruck appears to be Tesla’s most optimistic formula to date. Tesla’s factors are estimated to be 0.82 for the AWD truck to reach a 340-mile range and 0.79 for the Beast to get a range of 320 miles.
If Tesla used the industry norm of .7 that other manufacturers adhere to, the Cybertruck range would be about 290 miles for AWD and the Beast would get 283.5."