How does E10 save gas or reduce oil consumption? It now takes me >11.5 gallons of E10 to drive as far as I can on 10 gallons of pure gasoline. That means I use >10.35 gallons of gas!!!
by 
8 Jan 2004-10 Dec 2009
ANSWERS: 3
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That can't be right. Ethanol has about 70% of the energy of the equivalent volume of gasoline. Therefore, your mileage should decrease by about 3%. If you normally got 25MPG with gasoline, then you would travel 250 miles on 10 gallons of gasoline. On E10, you would need 10.31 gallons of E10, containing 9.28 gallons of gasoline. In fact, no matter what your mileage, it is always 10.31 gallons of E10 to equal pure gasoline. So there is a savings of 0.072% of gasoline by using E10.
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Jack01, What on Earth are you talking about? Your rant makes no sense. Your mileage decreases by all of 3%. You whine and complain about the cost but ignore the cost benefit of using 7.2% less gasoline by blending it with ethanol. The less gasoline we buy, the cheaper it costs. That whole supply/demand thing. If you want to complain about the cost of ethanol (which you can only do on the coasts, middle America gets it cheap), that's a different argument. Your rant misses the point by more miles than you are losing from our tank of blended gas.
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It occurs to me that ethanol is an "oxygenate" (added to gasoline to increase the oxygen content). . This may be fooling the oxygen sensor in your vehicle and causing it to "richen" the mixture, cutting down on your fuel economy.
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