The result of your conversion between miles/gallon(US) and petawatthour appears here
To convert between Miles/gallon(US) and Petawatthour you have to do the following:
First divide 5 / 3.6e+18 = 0.
Then multiply the amount of Miles/gallon(US) you want to convert to Petawatthour, use the chart below to guide you.
Symbol: m/G
No description
Symbol: PWh
No description