mileage performance of 3 types of gasoline additives on 2 types of cars is being studied. There can be 4 runs (at most) each day.

mileage performance of 3 types of gasoline additives on 2 types of cars is being studied. There can be 4 runs (at most) each day. We want to conduct the experiment within two weeks (the engineer is able to work seven days a week during this period if necessary).

Need help deciding which type of statistical model this falls under. I wasn't sure because since the engineer can work everyday is it a time constraint?