Can't say what would "suddenly" cause a drop in mileage. My car has 178,000 miles and until recently, I was getting a max of 29 MPG highway and 25 combined.

I just swapped the injector nozzles, adjusted the timing and re-torqued the delivery valve holders and it just purrs now. Plus it's getting 32+ MPG which thrills me no end!

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250