I've done 55 mpg with P&G behind a truck at about 60 mph, but my best highway trip was 71 mpg P&G with no truck. Trying to keep up with a truck really handicaps you and keeps you from making the most of the P&G rhythm.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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