Question 1082652
9 gallons to 14 gallons, difference of 5 gallons.


"go another 315 miles", and then "go another 240 miles", made a difference of 75 miles.


Traveled 75 miles and used 5 gallons of gasoline:
Fuel efficiency,  {{{(75/5)(miles/gallon)=highlight(15(miles/gallon))}}}.


DISTANCE FOR FULL TANK
9 gallons fuel, and the remaining distance of 315 miles;
{{{9*gallons*15*(miles/gallon)+315miles}}}
{{{highlight(450*miles)}}}-----for a full tank