I bought my G2 just after you did, but I've already burned through three tanks partly because it came with a used car warranty so I wanted to get some miles done in case it needed something that the warranty might partly cover.
My MFD reports a steady 4.4l/100km, and my fill ups have all been 4.6. This car does all those short trips that are so bad for Prius mileage.
Since your MFD shows the same as mine, I wonder if it's just the bladder contracting as the weather cools? But that would give you 'better' mileage...
If the bladder accepts 40L on a warm day, but only 35L on a cold day your 'cold' fill looks better.
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