| http://www.w3.org/ns/prov#value | - jeffk42, i have done a similar thing with an xcel spread sheet and have similar numbers. i commute over 100 miles each day and have also noticed a slight drop since they introduced the winter blends. most of my miles are highway at 65-75 mph and the mileage improves significantly if i keep it 55-60. over the course of almost 10000 miles, i averaged almost 19 mpg.
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