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The following data is applicable to my vehicle only, but seems to generally match what other owners experience. The method was refueling as soon as practical after observing the fuel gauge drop a bar. Mileage was noted at the time the bar dropped off and at the time the refueling was done. This way, the first mileage, divided by the seond served as a proxy measurement to compensate for the fuel used to reach the gas station (e.g. at 260.0 miles today, the fourth bar dropped off...I pulled into the gas station and filled up at 261.4 miles...my calculated correction factor is 0.9946442). With that data, the fuel pumped is multiplied by the correction factor, which yields the estimated fuel used to fill to the point where the bar dropped off (e.g. 0.9946442 x 10.740 = 10.682478).

The problem with the above method is the inherent spread on the autoshutoff of differing fuel pumps and the inaccuracy of the correction factor. To combat this, I discarded any fillup with a correction factor smaller than 0.98, which equates to .028 gallons on a fillup at 1 bar. Additionally, I simply selected the first gas station to fillup at. After multiple fillup data was acquired, I targeted additional fillups at levels where the standard deviation between the calculated fills was over 0.2 U.S. gallons. Outlying calculated figures were discarded, which somewhat fits the data, but also corrects for autoshutoff variability. No attempt was made to correct for fuel temperature.

So, what did I find out, that the Giulia has a very Italian gas gauge (U.S. gallons and liters rounded to one decimal point, the stated U.S. gallon capacity used for calculations):

Full/8 Bars is defaulted as 15.3 U.S. gallons or 58 liters

7 bars indicated remaining 12.3 U.S. gallons or 46.6 liters

6 bars indicated remaining 10.6 U.S. gallons or 40.1 liters

5 bars indicated remaining 8.9 U.S. gallons or 33.7 liters

4 bars indicated remaining 6.6 U.S. gallons or 25 liters

3 bars indicated remaining 4.8 U.S. gallons or 18.2 liters

2 bars indicated remaining 2.9 U.S. gallons or 11 liters

Orange gas light illuminates 1.8 U.S. gallons or 6.8 liters remaining

1 bar indicated remaining 1.4 U.S. gallons or 5.3 liters, gas gauge turns red

Notes:

-The most confusing part is the 3 U.S. gallons/11.4 liters 8th bar.

-The 5th bar is almost as bad, at 2.3 U.S gallons/8.7 liters worth.

-The 7th, 6th and 4th bars are all 1.7 U.S. gallons/6.4 liters.

-The 3rd bar is 1.9 U.S. gallons/7.2 liters and the 2nd bar is around 1.6 U.S. gallons/6.1 liters.

-The 1st bar is a pitiful 1.4 U.S. gallons/5.3 liters.

-A half tank indicated is really about 40% left.

-The last indicated "quarter" of the tank is more like 18-19% of the tank left.