I have heard that 85% ethanol is only 72% as energy efficient as regular unleaded but I can't find a source that tells how efficient 10% ethanol blend is. Let me know where you found the answer.
2007-09-01 15:01:06 · 6 answers · asked by Tom S 2 in Cars & Transportation ➔ Maintenance & Repairs
10% eethanol , will equal 10% fuel mileage lost , I deliver fuel and I have ran my cars on both blended and conventional , it averages that way most of the time ....... IF YOU SEE 89 OCTANE CHEAPER THAN 87 IT IS BLENDED 89 EETHANOL , AND THE 87 IS CONVENTIONAL . IF THE PUMP SAYS 10% BLEND AND 89 IS MORE THAN THE 87 , THERE IS A GOOD CHANCE BOTH ARE THE SAME . 87 OCTANE + 10% ETHANOL = 89 OCTANE FUEL , 89 CONVENTIONAL , IS 65% 87 OCTANE + 35% 93 OCTANE
2007-09-01 15:09:32 · answer #1 · answered by jon_wayne89 5 · 0⤊ 1⤋
Well there's a lot of wiggle room in that question in terms of what fuel efficiency means. As far as the amount of energy that is in the E10 blend, ethanol has 68% as much energy by volume as gasoline therefore a 10% by volume mix of ethanol and gasoline would have 0.9 + 0.1 * 0.68 or 0.968 times the amount of energy as in just pure gasoline (that's 96.8%). The fuel flow rate actually has to be increased by 3.3% ( 1 / 0.968 ) to compensate for the lower energy density. but ethanol has a higher octane rating then gasoline and is often added to gasoline to boost the octane rating, this means that if the engines were designed to vary the timing based on sensors then the added ethanol could result in more power being developed. Regardless, you'll have at the very least a 3.2% drop in fuel efficiency and probably more if your car is not able to take advantage of the higher octane and most cars aren't. It's E85 that's been giving ethanol a reputation for significantly dropping the fuel efficiency because E85 only has 72.8% of the energy of gasoline by volume.
2016-05-19 00:40:31 · answer #2 · answered by brinda 3 · 0⤊ 0⤋
I have heard about controversy about if overall ethanol is more energy efficient (from growing the corn to processing) but my own experience leads me to believe that as far as mileage goes, 10% ethanol is a bit better than straight gas.
2007-09-01 15:14:01 · answer #3 · answered by Thor 3 · 1⤊ 3⤋
most of that is urban ledgend now. when thay started introducing ethanol, it was crap. thats probably where the 72% comes from. refining processes have gotten much better in recent years. the 10% ethanol blend is now just as efficient as straight unleaded. ive heard its somehow easier on build-up in your engine(due to cleaner burning), but i dont have any referance to back that up. sorry.
2007-09-01 15:05:35 · answer #4 · answered by sketchy_larry 3 · 0⤊ 3⤋
10% ethanol is slightly less efficient, but produces less of the critical polution in certain big cities.
2007-09-01 15:08:03 · answer #5 · answered by Mike1942f 7 · 0⤊ 1⤋
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2007-09-01 15:05:05 · answer #6 · answered by Anonymous · 0⤊ 7⤋