I've been curious to see how well the average MPH and fuel consumption read out behave during cold weather. Today's temp was showing as 0C, it was dry and traffic light.
So this morning as I had to take my lad and girlfriend to the airport, which is a 90 mile round trip, all but 2 miles is motorway, I thought I'd see what it shows on a 45 mile return trip, constant speed and non stop trip.
On the return trip once I got onto the motorway I set all the readouts to zero.
I did a constant 55 mph and the average showed 55 mph.
Increased speed to 60 mph and the readout showed 58 mph after a short while.
Decided I'd keep to just below 60 (probably 58 mph) and by the time I'd got home the readout gave 57 mph.
On the fuel consumption readout for the journey it altered between 72.9 and 73.5 mile to the gallon.
(During the last week the readout was showing 46.9 for around town driving)