In my 1983 760 GLE D24T M46 I get 38-39 if I drive 70-71 mph, and 32 mpg if I drive 78-80 mph. I've conducted this test a couple of different times and the results have been consistant. I have the overall timing advanced about 5 degrees from the factory spec, so about 1.00 mm.
I want the timing to be advanced further at about 3000 rpm, so I've been considering replacing the spring beneath the motor side timing plate of the IP with a lighter duty one. If I don't do this, then I'll probally advance the overall timing another 3-5 degrees. I put more time on my engine at 2900-3000 rpm than any other speed.
|