I'm glad that the two issues you've encountered were resolved easily.
I've been wanting to add Region detection of the device to Fuel, so
that I could set the default Economy/Consumption value accordingly, I
just haven't looked deep enough into it yet; I'm not familiar enough
with which Regions use which format, so I need to do some research
first.
With regard to the state of the Fuel Efficiency indicator (the green/
red arrow with the "E" on it, that adorns the Fuel History divider)...
The purpose of this indicator is to display the fuel efficiency of the
vehicle, relative to the mean average; whether it takes more or less
fuel (than your mean average) to travel a given distance. Given it's
purpose, it appears to be displaying correctly... That is, if DPV is
greater than the DPV Mean (a greater distance was traveled per
volume), a green arrow points up, and if DPV is less than the DPV Mean
(a lesser distance was traveled per volume), a red arrow point down.
Likewise, if VPD is less than the VPD Mean (less fuel was consumed to
travel a given distance), a green arrow points up, and if VPD is
greater than the VPD Mean (more fuel was consumed to travel a given
distance), a red arrow points down. To clarify, the arrow indicates
efficiency, not directly whether economy or consumption has gone up or
down. Does that make more sense?
-Rob