Answer:
Explanation:
yes you have 16*1/4 = 4 gallons of gas in the tank, and we all know the gas gauges are not too accurate as they get low, there could be a lot less :0
but if you did have 4 gallons, and you could get 20 MPH, then you will only go
4*20 = 80 miles... have a nice 20 mile walk :/ or get gas , your choice :P