The prediction from the trend is the value of the y-coordinate of a point in the line trend. For a given weight of 2,250 pounds, the y-values on the line seem to be between 25 and 30. Notice that The value y=25 corresponds to a weight of 2500 pounds. Therefore, for a 2,250 pounds vehicle, the gas mileage would be roughly 28 miles per gallon.
Therefore, Jim's answer best fits the data.