1. The problem statement, all variables and given/known data Gasoline yields 4.8x10^7 J/kg when burned. How much energy does a car use travelling a distance of 150 km if it gets 25 miles per (British) gallon? Assume that the density of gasoline is 68% that of water. 2. Relevant equations 3. The attempt at a solution I dont really know where to begin with this question. All i know is that 25mpg is equal to 40.225km per gallon. Any suggestions?