The best replacement for litre is gallon.

The best alternatives to litre are rated as following:
★★★★★  gallon
★★★★  liter
★★★★  quart
★★  oz
★★  pint
★  gallon conversion
★  ounce
★  cubic inch
★  kg
  fifth
  us gallon
  gallon us
  gallons
  cups
  t/a 6.6
  cubic meter
  gal
  kilogram
  cubic metre
  kg conversion
  cubic inches

Your alternative for litre is not listed? Suggest!
Speaking about litre, one probably shouldn't forget about 1.2 litre.

Other search terms related to litre and their ratings are:
★★★★★ 1.2 litre
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litre
gallon
liter