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Like the electric range estimate the gas range is also just an estimate based on previous usage.

My guess is the gas engine was used in a series of short runs that never made it up to operating temperature. So the gas mileage will track as being poor. I would think a couple of decent runs on gasoline should resolve the estimated range.
Or all the previous test drivers were leadfoots. Like others said, drive graciously for awhile and you will see the range estimator go up. It's normal.
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