Question 340304
ethanol cost .75 per gallon.
gasoline cost 3.00 per gallon.
a 20/80 mixture of ethanol/gasoline costs .2*.75 + .8*3 = 2.55 per gallon.
fuel consumption is 25 miles per gallon.
miles driven per year is 15,000
for each person, the savings in gasoline would be .2 * 15000 / 25 gallons per year.
that equates to 120 gallons per year.
for 1 million people, the savings in gasoline would be 120 million gallons per year.
look at it another way:
15000 miles per year / 25 = 600 gallons of gasoline per year.
if only 80% of that was pure gasoline and 20% of that was ethanol, then the number of gallons of gasoline consumed is .8 * 600 = 480.
subtract 480 from 600 and you get 120 gallons of gasoline that is saved per year per person.
multiply that by 1 million and you get 120 million gallons of gasoline saved per year.