I'm confused about what happens when setting Nav to U.S. vs. other regions, regarding US gallons and Imperial gallons. Mine is a US E39 with Mk4, and it doesn't show the Accept screen but does calculate consumption in US gallons. It has gone into Imperial gallon mode and lost the Aux Vent option after S/W downgrade or upgrade, but disconnecting the battery briefly restores it to the hybrid Euro mode with US gallons and Aux vent option but no Accept screen.

So if NavCoder sets the region to US, then it should regain the annoying Accept screen, and will compute in US gallons. Then if I put it into Europe or Canada region, will the Accept screen disappear, but it will also go into imperial gallon mode? Is pulling battery power or fuses after it's in Euro mode the only way to get it into the hybrid Euro mode in which there's no Accept screen but it uses US gallons?

(In both the Imperial and US Euro modes, it displays yards rather than feet, and that is not a problem.)

Thanks