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Good article. Its the BTU numbers that matter as octane is just a knock rating.
A. 76,000 = BTU of energy in a gallon of ethanol
B. 116,090 = BTU of energy in a gallon of gasoline
C. .655 = 2/3 = GGE of energy in a gallon of ethanol. A / B.
D. 1.53 = Gallons of ethanol with the energy of 1 gallon of gasoline. D = B / A.
How much should you pay for E10 and E85?
If regular gas is $3.00/gallon you should pay
$2.90 / gallon for E10 (10% ethanol).
$2.13 / gallon for E85 (85% ethanol).
If regular gas is $2.00/gallon you should pay
$1.93 / gallon for E10 (10% ethanol).
$1.42 / gallon for E85 (85% ethanol).
Then you will be paying the same amount per mile driven.
The formula is this: For EX, where X is the percent ethanol
Ethanol price should = Gasoline price times (100 – X + X/1.52)/100
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