Read the following passage and answer the question. Passage: When you buy a car, examine carefully the important features of the model you are considering. Many a buyer of the latest models has got into trouble by buying a car too broad or too long for his garage. Furthermore a long car is much harder to manoeuvre in traffic and much more difficult to park. Another feature is the comfort afforded. Are the seats nice and durably upholstered? Is there enough glass area to give the driver a good view in all directions, particularly to the rear? It should be remembered that the heavier and more powerful a car is, the more expensive it will be to operate. High powered motors require expensive high-octane petrol. The greater weight means greater tyre wear and enlarged brakes. The old cliché is still true; it is not the initial cost but the upkeep which matters! According to this passage, the two factors that the buyer of a new car should keep in mind are