"Are your 200's automatics or manuals?"

Some of each. And, yes, the automatic's tend to use a bit more fuel. My old '82 245 MPG 4spd-OD used to get upwards of 32-33 on the highway if driven very carefully and around 26-28 in normal city-highway commuting.

My '86 245 A/T gets about 22-23 around town and 25-26 on the highway.

My '90 240 A/T sedan gets about 25-26 around town and 27-28 -- or better -- on the highway.

My '82 245T gets about 18-25 everywhere, and depends heavily on the heavy foot. When I *really* restrain myself, it gets about 23-25. (Keep in mind that the turbo engine is lower compression and so is less efficient when not "on" the turbo.)

"I'm by no means a leadfoot..."

Run an experiment. Fill up and reset your trip odo. When you get to 300 miles, fill up again and calculate your mileage. Keep in mind that your tank holds around 15 gallons, so if you only fill 12 gallons, then you had 3 to go (around 75 miles of safety margin) before running out.

By knowing your typical fuel consumption, you can calibrate your "odomoeter consumption."

--
Don Foster (near Cape Cod, MA)