Update since my last post : I had my car's wheels aligned.
I can let go of the wheel at 70 MPH, and it now takes a several seconds before I reach the side of the road. ( versus right away as before )
However, there is no change in my MPG.
The car still got 31 MPG on the 130 mile trip to my parents.
I plan to take the car in for a check up, and would like to know what to test for.
All the obvious things seem fine. Plugs and wires are good. Idle is good. Oil is fine, tires and tire pressure are fine, transmission is fine, etc.
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