I think you need to recheck your meter.

.6 volts is a 12 percent drop.

if you truly have a 1/4 tank and it reads 3/4 you need a 30 percent drop to make it right.
which is technically 1.65 volt drop.

for something that is almost exactly 5 volts, that is a whole lot of drop.

that would fix you if you were at say 1/4 tank but it read just under a half.

verify your meter reading first. check a AA battery and make sure it reads 1.56 ish.