How can this be?

[OO58RON]

36.1
(+1.0)
Avg UK MPG

35.9
(-1.2)
Last UK MPG

38.9
(04/07/2014)
Best UK MPG

37.1
Running Avg UK MPG

Values
1,404,500M
1,405,000M
35
37.5
40
UK MPG Trend
38
Fuel-ups
38.9
Best UK MPG
5,802.0
Miles Tracked

It can't be averaging 36.1 per Gallon and also 37.1 per Gallon using the same figures?

[trollbait]

I believe the running average is the last 10 fill ups only.

[Jay2TheRescue]

Correct. The running average is the average of the last 10 fillups.