Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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I use Sam's gas when I can because it is substantially less expensive than brands around here. The comment about lots of volume keeping the tanks clean is right, and the tanks at my Sam's were put in the ground about two years ago, so they are plastic.
I buy brand (Chevron or Shell) about half the time, but I run a tank of Techron (the only gas additive M-B approves) through it every 5k miles or so, so that detergent dose offsets whatever detergents are missing from Sam's.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck