Contour Enthusiasts Group Archives Forums General General Is this correct way to gauge gas mileage?

Yes that is correct.
You'll get better(more accurate) results if you do it over a longer period of time though.
I.e. Fill the tank completly at the first of the month, and record the odometer reading. Keep all your recipts for the month and add them up and then devide by miles driven, making sure to have filled the tank full on the last fill up.

These engines can be efficient when driven properly. When I first got my '95 I had some tanks I got as good as 32MPG. The Mystique just before we retired it was getting 28.