Here is the up-to-date mpg graph for our 2009 35d. Information on how I produce this graph is in my prior posts in this thread.
The interesting point is that our long term average mpg continues to improve

It is now just under 23 mpg, even though we use our 35d as a WORK TRUCK. By that I mean we regularly haul full loads of building materials in our 5x9 heavy duty utility trailer, and occasionally a couple of tons of quarry materials. Our beauty/beast never fails to draw comments at lumber yards & quarries as we load up
Funf Dreisig