I know, that in England it´s no big deal, but I´m afraid here in Austria, I will be in big trouble, when e.g. starting the car in 800m height and it reads lean, how will it be in even higher places! ;(
Doesn´t the sensor read absolut pressure and barometric differences when I drive around all the time?
As it seemed that the AFRs stayed lean, even when I arrived "sealevel" (300m here in Vienna, the same altitude as the car was mapped and driven 99% of the time) as well and I had no problem when going up the mountain at all, just after letting the car cool down and driving back home after a stop of about 3hours.
Many thanks for all informations and advices on this topic!

Greets from Austria
Markus