If Mallory gammy's house is 2000 miles away and she has to refill the fuel tank every 500 miles, she filled the tank 2000/500 = <<2000/500=4>>4 times.
If each refill costs $45, the total amount of money she used on refilling the tank is $45*4 = $<<45*4=180>>180
The food cost was 3/5 times as much as the fuel costs, which is 3/5*$180 = $<<3/5*180=108>>108
On the whole journey, Mallory expenses on fuel and food costs are $108+$180 = $<<108+180=288>>288
#### 288