One of the most popular questions on the ELM327 adapter, concerns twisting. I can honestly say that the mileage of a modern car is recorded in a large number of blocks, and it is almost impossible to twist it completely. In addition, this is an offense, which should be punishable by law.
As for getting real mileage data, it all depends on a lot of factors: car model, ELM327 adapter model, program. If there is a reference for your car - you can repeat the procedure yourself. If not, you can only play with the variable search, or use another autoscanner.