Hey Bruce, long time no speak. I'm happy to see you are keeping up the 240. You seem pretty dedicated to improving the fuel economy of the 240 wagon. I would seriously consider the M47 swap I did. The difference in consumption between the no lock up AW70 and M47 is massive. We saw as much as 32mpg on the highway on a couple of occasions but 27-28mpg most tanks. I know it seems like a big project but with a little planning its totally doable.
After the accident (the 240 was totaled) Liz is driving a 96 NA 855 5 speed averaging about 24mpg with lots of city driving. I'm working on it
Cheers
Justin