Question 896415
The distance of 808 miles really doesn't factor in because you know it takes 36.73 gallons to get there (it factored in before, but it doesn't matter now).



At worst, your car holds 15 gallons. 
36.73/15 = 2.44866 which rounds up to 3. 
Because you already start off with a full tank of 15 gallons, you really only need to fill up 3-1 = 2 times.



At best, your car holds 18 gallons. 
36.73/18 = 2.04055 which rounds up to 3. 
Same idea as above: you need to fill up your tank 2 times.



Note: by "fill up" I mean fill up *completely*.