Es gab mal so ein PDF vom MIT.
Das ist aber leider offline...
EDIT: Doch noch ON
da wurde über Ethanol und Methanol in Bezug auf Oktan diskutiert. EDIT: Ist beides ganz gut 
EDIT:
Zu Ethanol + Methanol lässt sich sagen, wenn es sich um nen Direkteinspritzer handelt, dann steigt Oktanzahl immens nach oben o_0 --> effectiv octane
Habe auf die Schnelle das gefunden:
here are some points of interest, Facts and opinions that I have found compairing the two......
Ethanol vs Methanol
Methanol and Ethanol both have advantages and disadvantages over fossil fuels, such as petrolium and diesel. For instance, both alcohols can run at a much higher compression ratio without octane-boosting additives
Alcohols burn more completely because their molecules contain oxygen;
Oxygenated chemical compounds contain oxygen as a part of their chemical structure. The term usually refers to oxygenated fuels. Oxygenates are usually employed as gasoline additives to reduce carbon monoxide that is created during the burning of the fuel….. Carbon Monoxide is BAD!
The oxygenate MTBE has been found to have contaminated groundwater, mostly through leaks in underground gasoline storage tanks. In 2004, California and New York banned MTBE, generally replacing it with ethanol.(Ethanol is Biodegradible…..wont harm the environment!)
Alcohol fuels such as methanol and ethanol, are partially oxidized fuels and need to be run at much richer mixtures than gasoline.
As a consequence, the total volume of fuel burned per cycle counterbalances the lower energy per unit volume, and the net energy released per cycle is higher
Carbon monoxide emissions are 100% lower than fossil-fueled engines because the only products of an alcohol combustion reaction are carbon dioxide (plants breath this), water (plants need this) , and heat .
Methanol is the lightest and simplest alcohol, produced from the natural gas component methane. Its application is limited due to its toxicity…..IT WILL KILL YOU!
Ethanol, also known as grain alcohol or ethyl alcohol, is most commonly used in alcoholic beverages. However, it may also be used as a fuel….YOU CAN DRINK IT!
Methanol’s octane rating is 129 (RON), 103 (MON), which equates to 113 (AKI)
Ethanol's octane rating is 129 (RON), 102 (MON), which equates to 116 (AKI).
Gasoline is approximately 91 (RON), 81 (MON), equal to 86 (AKI)
AKI is 'Anti-Knock Index'
It should be noted that octane rating does not relate to the energy content of the fuel or heating value, nor the speed at which the flame initiated by the spark plug propagates across the cylinder. It is only a measure of the fuel's resistance to autoignition.
Ethanol is harder to ignite than Methanol.
Ethanol is less likely to have detonation than Methanol.
Ethanol has 27% less energy per Gallon than Gas.
Methanol has 55% less energy per Gallon than Gas.
This is why more volume is required for each of the Alcohol fuels and why Methanol take almost twice as much fuel as Ethanol
If gasoline is run at its preferred maximum power air/fuel mixture of 12.5:1 air/fuel ratio, it will release approximately 20 MJ (about 19,000 BTU) of energy, where ethanol run at its preferred maximum power mixture of 6.5:1 air/fuel ratio will liberate approximately 25.7 MJ (24,400 BTU), and methanol at a 4.5:1 air/fuel ratio liberates about 29.1 MJ (27,650 BTU).
Methanol makes the most power (29.1 MJ), but also may take 1.5 times more fuel than Ethanol to make that power…..almost 2.5 times more fuel than GAS.
Apples to Apples….. Ethanol will out perform Methanol.
Methanol gets its power from the volume consumed.
Combustion:
Methanol combustion is: 2CH3OH + 3O2 → 2CO2 + 4H2O + heat
Ethanol combustion is: C2H5OH + 3O2 → 2CO2 + 3H2O + heat
CO2 = carbon dioxide (plants breath this)
H2O = water (plants need this) ,
heat = heat.
As you can see above, Methanol produces more water during combustion than ethanol. Methanol = 4xH2O to Ethanol = 3xH2O….
Hydrogen (H) may reduce knock by contributing its high thermal conductivity
Methanol has 4 hydrogens, Ethanol has 6 hydrogens,
= Which means Ethanol absorbs more heat and therefor is more energy efficient, effeciency in the right conditions is power without the knock.
Given the higher octane rating of Ethanol, Modified engines are capable of generating equivalent or higher horsepower and torque burning Ethanol than conventional gasoline, and possibly Methanol, despite the lower energy density of Ethanol.
Alcohols higher octane allows/requires an increase of an engine's compression ratio for increased thermal efficiency.
In one study, complex engine controls and increased exhaust gas recirculation allowed a compression ratio of 19.5 with Ethanol to E50…..I personally don’t go above 13.5:1 ratio.
With Ethanols thermal efficiency, up to approximately that for a diesel, was achieved.
This would result in the MPG (miles per gallon) of a dedicated ethanol vehicle to be about the same as one burning gasoline…..your not getting that with Methanol because of the volume needed to produce the power!
My opinion is that the over all best fuel is Ethanol....it is certanly the cheapest right now.
E85 gives you best features of gas with the best of Ethanol.....
Hope this helps set some things clear……
<----im going faster on E85 than I EVER went before.
