Early in development, two prototype automobiles were tested to estimate the fuel consumption (i.e., average miles per gallon). The net average of the three vehicles over 20,000 miles was reported to...

Early in development, two prototype automobiles were tested to estimate the fuel consumption (i.e., average miles per gallon). The net average of the three vehicles over 20,000 miles was reported to management. Describe what could be done differently to this test if we wanted to better understand characteristics that affect fuel consumption.