Bought 1999 E300TD 11/98. I have gotten 31 mpg only once on trip from Texas to FL. Usually get max of 30 on Hwy and around 25 in city/freeway driving. Using a/c doesn't seem to affect mileage. Have 17,000 miles on it. Seems to run great. I have heard others get better, but most are 25-30 range.