It can be done, but not without risk to principal.
100% guaranteed US long term bonds are not even yielding 5%, but a careful selection of stocks could and does yield that and more over time. But, they carry risk and no guarantees.
If you could generate 80k, a strategy I would employ if living there would be to take a portion of the 80k not needed for monthly living expenses and invest that in peso certificates giving you additional compounding of your money.
As to 100k vehicles, most higher end AudI’s, BMW’s, Lexus, Infiniti, Mercedes, Acura etc., are all over 100k here……and there are, as you suggest, lots of them around.
Respectfully,
Playacaribe2