Answer is 1390.71 miles on 30.7 gallons gas
Step by step
We can find the ratio of miles per gallon by dividing Miles/ gallons from the table
588.9 / 13 = 45.3 miles per gallon
1494.9 / 33 = 45.3 miles per gallon
2219.7 / 49 = 45.3 miles per gallon
So the ratio is consistently 45.3 miles per 1 gallon
To find out how many miles per 30.7 gallons of gas, multiply 30.7 gallons x 45.3 mpg =
1390.71 miles with 30.7 gallons of gas