It's the 300E. The manual states that it's located in just about the area you described. But I just filled the tank up today, so I won't go about removing it until later in the week.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car