heat released from combustion reaction in the car engine is the propelling force

Question

heat released from combustion reaction in the car engine is the propelling force the drives the car forward. The heat(energy) is often measured in BTU( British Thermal Unit). The chart below lists the combustion heat value, density and price of 3 common fuels in the market:E 85, gasoline and diesel. Calculate and show, from purely economic perspective, which one gives the best bang for the buck.( You need to identify which represents the value and compare it among the three)

Combustion Heat(BTU/lb) E85:1200

Gasoline:2000

Diesel:19300

Density(g/mL) E85:0.789

Gasoline:0.74

Diesel:0.85

Price( Dollar/Gallon) E85:1.499

Gasoline: 1.799

Diesel:2.099

Explanation / Answer

1 gallon = 3785.41 ml and 1 lb =453.59237 gm

we can neglect units as they are same in all cases

1)

E85 = 1200*0.789/1.499 = 631.62

2)

gasoline = 2000*0.74/1.799 = 822.68

3)

diesel = 19300*0.85/2.099 = 7815.63

so diesel

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