Ethanol 85 is really just a bunch of heapy jeapy nonsense. We've been studying it in chem class.
Ethanol essentially burns a heck of alot faster than normal gasoline and thus you're fuel mileage is basically ruined in the process. It doesn't nearly produce as much toxic emissions as normal petrol does, but in the long run, you don't really save much on gas prices because the ethanol burns faster and you will fill up more frequently. Also, when Ethanol is burned, it produces water and CO2 which acts as a global warming agent.
I think it's just to ease the publics concern on the topics of global warming and the alarming decrease in oil supply with everyone saying "Oh we've found an alternate fuel source for our automobiles." I mean, if it goes well, it may reduce the use of fossil fuels but the threat of global warming and the decreasing amount of oil is still inevitable.
You are obviously wrong, either by not paying attention to the teacher, or by being lied to by the teacher...
Ethanol + air mixtures burns slower than normal gasoline + air. It's also much more simpler composed than gasoline, that has hundreds of different carbon-based
chemical molecules. Ethanol combustion is more consistent and "predictable" than gasoline ditto. An engine run at pure ethanol produces virtually no soot, since all
molecules react at the same temperature, whereas even stociometric gasoline combustion will emit unburnt carbon based residues.
(Something that the cat has to oxidize later.) Gasoline is also much more prone to knocking and "pingin"(?), due to uneven combustion.
The volumetric energy content is less in ethanol, so you need more E85 than gasoline to move your car a certain distance.
The octane rating is much higher in ethanol, which allows you to run higher compression ratio (modify engine), which increases power and fuel efficiency.
MOST IMPORTANT: gasoline is fossilized carbons = contributes to global warming.
Ethanol can be made of "green carbon" = NO or very little contribution to global warming.
NB! Already by mixing 5 or 10% ethanol in the gasoline you will increase power, fuel efficiency (due to synergetic effects) and reduce global warming effects!
/Alexander - who prefers facts, not urban myths