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rob490, One other thought, I used to get poor milage from my MINI until I noticed that the pattern was random and always occurred when I filled up at a certain (name brand) station. On one occasion I filled 14.6 gallons - in a 13.1 gallon Clubman tank. This station/pump was over stating the volume and thus over pricing the fuel. My milage, divided by the bigger gallon number gave a lower avg. milage.
You said you (always?) use Chevron and if it is always at the same station you might verify the numbers with a fill at the newest other station you can find. The new station is more likely to have recently certified pumps.
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