WTB 4Matic W210.. Questions

[jake12tech]

I just found a 99 E320 4Matic for sale that sparked my interest and I'd consider selling my 92 300D if this was to work out, but legalities are always involved first. This one looks promising, and I would have my first 4Matic which is a great winter driver. Now for questions..

#1. I've fixed 4Matic W124s quite a few times in the past. They are great for putting your savings account on a diet. Was the 4Matic improved in the later years such as the W220, W210?

#2. How's fuel economy? I have a diesel for excellent fuel economy. Although, it's nice to get at least 25MPG mixed and hopefully a little all highway. but I might be shooting for the stars as 4Matic drags economy down just a tad due to extra weight.

Either at this point it's this or an S430 4Matic. I've always like those since I worked on a customers who's become a personal friend.