My 300SD gets 23mpg consistently on B100, in city only, driven by my wife. However when we take it on a road trip it will pull 26 to 27. I tend to drive 75mph on the highway and use the cruise.

Now the Escort gets 42mpg on B100 driving to and from work, 42 miles per day but that's another story.

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Retired
ASE Master Car / Light Truck
ASE Master Medium Heavy Truck
EVT Master Technician Ambulance
EVT Master Technician Fire Apparatus

"Without Fleet The Pride Doesn't Ride"

1983 300SD 609K + still going strong!
1970 Monte Carlo
1994 Ford F150