Cetane is very important...just made a 2300 miles
round trip out of Missouri and across Arkansas and
Texas. Bought diesel at several stations on the trip
out, however on the return trip I stopped at the "Love
Stations" only and my mileage jumped from 26.5 to 29.44
with the diesel from Love's stations. This was with
the same speeds, (70/75 and some 80) however I had more head wind coming back from So. Texas. This was in the
Mercedes 300D Turbo with 262,000 miles and used no oil.

Bill