This morning I achieved my best ever fillup: 32.01 MPG (highway)
EPA highway: 24 (old rating).
This was the first tank driven following completion of Stage III of the lower air dam extension on this car. Project also includes a belly pan covering the area forward of the front axles, right up to the air dam's lower edge.
I think with this setup I should be steadily between 30-32 MPG for the summer. I hope to do additional aerodynamic work on the car however other needs at home may come first.
Yes I'm sure that a splitter (as opposed to an air dam) plus front end treatment would be give even better results. But I don't want to rebuild the car into something else; I want it to still look like a Volvo 240. I'm considering side skirts, rear wheel skirts and a truncated boattail (spoilers actually) for the rear.
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Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.