For city driving, the Metro would go the farthest. For highway driving, the Navigator would go farthest, although not significantly farther. You might also consider combinations of city and highway driving.

Complete Solution:
Different combinations of city and highway driving are possible. If you assume all driving is done on the highway, the Navigator should go farthest as seen in the chart below, but all three go approximately the same distance.

 CAR Highway Mileage (mpg) Tank Capacity (gal.) Approximate Distance (miles) Century 29 17.5 508 Metro 49 10.3 505 Navigator 17 30 510

If you assume all driving is done in the city, the Metro will go the farthest.

 CAR City Mileage (mpg) Tank Capacity (gal.) Approximate Distance (miles) Century 20 17.5 350 Metro 44 10.3 453 Navigator 13 30 390

You might also consider different combinations of highway and city driving.

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