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The claim. Tide Coldwater saves you "up to $65 a year," since you can wash in cold water, not warm. The check. Our engineers crunched the numbers, using Procter & Gamble's footnoted assumptions: seven loads of laundry per week, a water heater set at 140[degrees] F, and 2007 national average electric rates. CR's take. Cold is cool: You might save $65 a year, especially in an older, ...