On average, city bus drivers who are using the new computerized fare-collection system have a much better on-time record than do drivers using the old fare-collection system  Millicent Smith has the best on-time record of any bus driver in the city
Ttherefore, she must be using the computerized fare-collection system
This tomato is the largest of this year's crop. Since the tomatoes in the experimental plot are on average larger than those grown in the regular plots, this tomato must have been grown in the experimental plot.