The precision of integers with trailing zeros is ambiguous. The precision of 20400 litres can be 1, 10 or 100.
Corresponding to these values, the greatest possible errors can be 0.5L, 5L or 50L.
Actually, the precision could even be 20400L, in which case the maximum possible error is 10200L. If, for example, you had tanks of 20400L each, you might simply know how many tanks' worth you had - precision to 20400L. Unlikely, though.
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The answer depends on the measurement precision. If the figure is correct to the last decimal, the greatest possible error is 0.0005 oz. However, the figure could refer to 11 oz + 32 drachms. If accurate to the nearest drachm, the greatest possible error is 0.00195 oz.
Assuming the number is written to its greatest precision, it will be half of the place of the last digit. Since the 9 is in the tenths place, the greatest possible error is ±0.5*a tenth = ±0.05 metres.
The greatest possible error is 0.0005
Assuming that the measurement is to the nearest 0.01, the greatest possible error is 0.005.
If the numbers are rounded to the nearest 750, then 375 is the greatest possible error. Although you are not likely to have counted in 750s, it is quite possible that you counted in 50s (greatest error = 25). Or in tens (GE = 5) or in units (ones), when the greatest error is 0.5. The greatest possible error is half of the smallest unit of measurement.