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Eco Warm versus Cold settings on front load washer

I am trying to figure out which is more efficient, washing in cold water or eco warm, assuming of course that the clothes come out of either clean. Cold water cycle lasts about 15 minutes longer, but does not use any energy in using heated water. Is there a calculator available to work this out? If not: 

Do both cycles use the same amount of water? How much water is used?

What temperature is eco warm set to?

Any other differences in the cycles that I should know in order to figure this out? 

I have a four-year-old front-load HE washer and dryer.