The petrol tank on a E320 holds about 17 galls (model without ski bag fitted
in which the tank is smaller) therefore 156 miles from about 8.5 galls gives
18 - 19 mpg. My 96 E320 (4 sp auto) returns about 19-20 mpg under mixed
driving conditions so your consumption seems about right. BTW - if yours is
an auto don't use the box in the "E" setting as this so called "economy
setting" adversely affects fuel consumption when driving in an urban
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