I get the same mileage figures as you in the 98 E-300TD on my long New England road trips. I try to keep the speed at a steady 70mph... turn her loose when I need to just go with the flow. Run the AC in economy mode as much as possible.

Non-diesel people think your lying when you tell them what kind of mileage your getting in one of the heaviest 4 door sedans on the road......

Cheers,

__________________
FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K