$80k a year in the US (assuming you live outside of a few of very high cost of living locations) will easily net you a new BMW every three years, esp. given that they're much cheaper than in Sweden.
Check the VW Golf comparison. I also did a quick search for a BMW i8, the price in Sweden was ~10x in SEK than the price in USD (1 USD = 9.41 SEK), and I don’t know whether taxes were included in the US price, probably not.
In the US, the MSRP for new VW Golf is around $22k, so you can probably get one for $20k or less if you shop around the dealerships. On top of that $20k, you'll pay sales tax, which is 10% in most expensive places, and usually something like 6-8%.
When comparing BMW prices, don't look at some weird cars that nobody buys like i8, look at popular BMWs. For example, 2020 BMW X5 here costs something around $70k, depending on the features.
https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou...
Check the VW Golf comparison. I also did a quick search for a BMW i8, the price in Sweden was ~10x in SEK than the price in USD (1 USD = 9.41 SEK), and I don’t know whether taxes were included in the US price, probably not.