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OK, to bring this full-circle, so to speak.
I never did make the road trip that would have used a full-tank...but I drove the car since last Friday for one tank of gas down to the "fuel low" light...my cut-off for reading the miles driven. I plan to fill it up again tomorrow and start again but the next go-round will take longer as I'll be out of town next week.
Anyway...from full-tank to the "fuel low" light is approximately 12.5 gallons according to our VW mechanic and 12.6 according to the manual, also evidenced by how much it takes to refill the tank, give or take a tenth or two.
When the light went on/beeped today the miles read 463.9. ...divided by 12.6 gallons = 36.8 mpg. I'm believing this, as my previous experiments have yielded approximately 33-37.something. I believe this is not only repeatable but improvable, as my wife drove the car between 30-40 miles of the tank and she flogs it like a rented mule.
The mechanic says one of their techs is a mileage nut and will have a couple of tips for me, including his pick for best LRR tires, which is the next improvement planned. (currently Nokian "rain groove" type tires)
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