Well VWbuge yours is sort of an exception to normal, unfortunately nobody can find out what is causing the poor mileage. Isn't it more like 21mpg after the corrected mileage?

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k