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Did you already sign a warranty when you bought the car? Check your paperwork and make sure. It could have been a mix-up. Barring that, call...
I didn't realize that filling the tank could very by that much. That's probably making the difference. Thanks for the heads up.
I've had my Prius since early Feb and am at just over 10k miles and just had my 2nd oil change. Lately, I've been doing my own milage...