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Originally Posted by MB-SV  I assume you are using the trip computer. Doesn't sound like your are doing total tank mileage (miles traveled / gallons pumped in to fill) at time of fillup. |
My experience with trip computers is that they always show an optimistic number when you compare it to actual mileage. Have not checked my CLS 550 numbers yet but on a recent road trip to Phoenix and back from Orange County computer showed 24.3 each way. Usually around 15 in town.