I think by "mileage" he means how many miles you can travel before fill-up. Not fuel economy, which is MPG.
Filling up at half a tank will not affect MPG, but will impact how many miles you can go until you fill up again.
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\"If I had a diesel rig, with a big ol\' blade, courtesy would reign, arguments abate, cuz everyone would know, I\'d SQUASH \'EM LIKE A GRAAAAAPE!\" -- Heywood Banks, \"If I Had a Bulldozer\"
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