PeachParts Mercedes-Benz Forum - View Single Post - Economy dropping off

F18 · #9 01-05-2006, 08:41 PM

Hey Ryan!
I agree with Brandon on doing a valve adjustment.....it can really make a difference in the performance of those engines and it can't hurt especially if you don't know if or when the last time it was doneon your 85.
On all my diesels MPG varied from summer to fall then winter. Summer, with AC and all interior environmental controls on was lower than Fall and Spring when I could run in economy mode (AC off). But as soon as winter blend fuel was at the pump the economy would drop a little again. Example of my mileage on 100% highway
84 300SD 27-28 summer , 28-30 fall/spring , winter 27-29 (depending on atitiude) The 300SDL got slightly higher mileage when fuel and conditions were right than the old 84.......31mpg max!
The 98 E-300TD was getting around 34-35mpg this fall with AC off and driving 65. This winter its down to 31-32 if I get a good fill. Winter diesel foams so much its hard to get a good fill and a accurate mpg read.
Happy New Year to ALL!