The truth will come out in 4-5 tanks.
My mileage swings up and down by almost 10mpg on each tank, depending on when the bloody pump shuts off the nozzle. I don't take the risk of topping off repeatedly like some. I do slow the pump down when I know it's nearing the top though - makes for a little more consistency.
I'm quite interested to see what sort of improvements you can make. I've got an xB and may be in the market for a replacement car for my aging civic.
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