Hmm,
I get approx 9 MPG in my Euro 500 running propane! I do give regular italian tune ups though, and am rarely out on the highway.
I really should start relaxing my right foot more.

Ben

Edit:

I should mention that the timing chain is new, the ignition timing is spot on, and my CO level is set to as per the cam cover sticker and the AC is on.

__________________
Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i