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93 300se, 94 s420, 98 s420, 95 s500, 97 s500, 96 s320w, 96s320, 99 s420
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Discussion Starter #1
how come when i fill up the car with 93 premium from mobil i barely pull 16-18 mpg in the highway and when i fill it at sunoco i got 22.5 miles to the gallon?? how is that posible.??? just got back home from a 180 miles trip and before left toped off my car at a sunoco station the arrow moved only a 2/8 over the 3/4 gauge and got 180 miles with 8 gallons??

this rate is for my 94 S420
 
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