More Economical to Buy Liquid or Foam Handwash?

The palmolive liquid handwash refill 1L is regularly on sale for $6.60 but the palmolive foaming handwash refill 500ml is regularly on sale for $4.40 which is $8.80 converted to 1L. The answer might seem obvious but doesn't foam use less in general making it more economical?

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