Well this is an M5 board , I know , and a good gas milage is just something that does not come with an M5
So my daily drive is a Audi A4 Avant 1.9Tdi and I get to do 1100Km
with one tank (64L)
You can see the computer with a 5.4L/100km , that I ve already done 767.4 kms and that the tank is still over the 1/4 part (its more like 4/10

)
Show me your best milage !!