Our @chevrolet ZR2 diesel needed DEF. Light was on and the warning dropped below 300 miles. Tank holds 5.3 gallons, so 5 ought to fit now, right? Nope. Had a half-gallon left when it started spitting. 👎🏼 C’mon, let’s size the tank or time the warning so five gallons will go in when the light comes on. Now I’ve got leftovers. An actual gauge would be nice, too. Our Ram Ecodiesel has that.