The mileage yield per gallon

The following are the mileage yield per gallon which a test driver consumed for 5 containers each of four kinds of gasoline. Use non-parametric test at the level of significance alpha =.05 to check the claim that the there is no significant difference in the true average mileage yield of the four kinds of gasoline.
Gasoline Brand Miles/ Gallon
C P S T
24 21 28 29
17 31 23 16
21 32 26 18
31 19 31 31
22 17 14 20