I haven't kept the best track of the mileage, but I would guess low 20s.
One funny thing I have noticed is that when you fill it up with gas, the auto shutoff seems to be "quicker" than either of my 135s. I like seeing the needle all the way full - so it takes some coaxing with the pump clicking off 100 times to get it there...small gripe, but a gripe.
EDIT - mine is a manual.