26.4 miles per gallon
Explanantion:
We need to find the difference in the odometer reading. This will give the number miles it covered.
Initial = 42,911.8
Next raeding = 43,373.8
difference = 43373.8 - 42911.8 = 462
Distance = 462 miles
Number of gallons = 17.5gal
Miles per gallon = distance/number of gallons
Miles per gallon = 462/17.5
Miles per gallon = 26.4 miles per gallon