Slant Six Fuel Mileage?

Mike's Dart said

I fueled up 45 miles back and the fuel gauge has dropped from "F" to 3/4 tank? The original owner's manual says this car has a 16 gallon tank, I guess that is correct? We installed a new sending unit 10 days ago and it just seems to be a bit hard on gas. I'll top off Saturday and see what the math says about the mpg on my /6 engine. It just seems like that gauge is moving south in a hurry? Checked for leaks at the new sending unit and it's still dry? Thanks in advance for your input!

Mike

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the only accurate way to determine miles per gallon is to divide the actual miles traveled by the gallons of fuel consumed. Be sure to determine the accuracy of the odometer,,,
Concerning slant six fuel mileage,, the slant was an economy motor back when the average full sized V8 car was betting 12 to 14 MPG. With a slant, depending upon the state of engine tune and the care given to the vehicle itself, front end alignment, proper air pressure in tires, brakes not dragging,how the car is driven, I would expect between 14 to 18 in town and high teens to low 20's on the highway. A slant built today for max economy could exceed that.