Understanding the MPG display symbols

[Guanajuato]

I think I disagree with Paul's list a bit

Average MPG e.g 45 MPG - which is fine except that it fluctuates widely sometimes, showing 999 which I guess is in response to the fuel moving about
if its fluctuating, then its your instantaneous mpg

The next one is a lollypop symbol >> 2800 - I'm guessing this is milage since the last service?
That's mileage since the last reset of the trip computer - reset by pressing and holding the stalk button

Then I get the lollypop ---45.3----petrol pump symbol - but the 45.3 doesn't change at all
That's the mileage let in the tank, which can actually go up quite a lot. One a drive over to Bradford, it started off as showing 110 miles, but was about 160 when we got there. Without filling up.

Then I have a car symbol >> 22mph - no idea on this one
That's average speed since last reset.
Any ideas folks

There's also a symbol set for average MPG (since last reset)[/b] - I think it involves the lollypop. I'm pretty sure the details are in the car's handbook.