2016 GT - Miles to empty?

I primarily city drive these days. I always fill up at 1/4 tank and the computer (I reset trip miles each fill up) usually is around 250-280 miles. Highway would probably be closer to your number, 7.
 
My warning light comes on, i fill within 30 miles and i fill 11.5 gallons (RARELY I HIT 12 Gallons).
So 11.5 gallons X 28 mpg ~ 320 miles. If your GT is showing 380 and actually giving you 380 you are one of the lucky ones.

2016 GT AWD here as well, and I agree - I've never shown more than 330 miles after a fill, and also RARELY hit 12 gallons.
 
I can never understand how anyone runs out of fuel these days, the warning light comes on so early these days. At least 50 miles left when it shows zero I would say.
 
I think the calculation is using your actual average mileage rather than EPA so if you have been heavy on the foot your range will be lower. Check your average mileage...
 
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