I had my Mazda3 2014 for a little over a year now. It always seemed to me that the fuel gauge is over-cautious by a generous margin, but only last week I put this assumption to the test. I ran until there was one little line left on the fuel gauge and the Range estimate was 10 kilometers (6 miles).

Hence, according to the dash indicators, I should have had roughly 2 liters (half a gallon) of fuel left in the tank. Since the tank capacity is 50 Lit (13 Gal) I thought that, in order to fill it, I would need roughly 48 Lit (50 - 2) or 12.5 Gal (13 - 0.5) of fuel.

But the pump stopped at 38 Lit (10 Gal). The margin is then 10 Lit (or 2.5 Gal) - which is huge and leads me to believe that there's probably something wrong with the fuel gauge.

How is your fuel gauge behaving? Has anyone experienced something similar?

Thanks in advance for any answers.