Por que a distinção importa
Imperial gallon and cubic inch belong to measurement conventions that may look familiar but are not always equivalent across countries. Mendeleev.com therefore keeps the system name next to the abbreviation and calculates from defined conversion factors rather than rounded kitchen rules.
Exemplo
1 imp gal = 277.419432792 in³ · 10 imp gal = 2 774.19433 in³.
277.419432792 in³