I noticed that there was a small difference in gas mileage between what my car said (21.2, mostly delivering the last 2 days) and what it actually was when I filled up (20.1). I don't expect the computer to have it perfect, but I decided to see if there was a discrepancy with highway miles. So I took Cleo out on the road this morning...racked up about 70 miles.
Cleo said 37.3. Actual? 40.6.
Those damned people at GM...trying to manipulate gas mileage!
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