87 octane vs 89 octane

[pgfpro]

Lots of great info.^^^^^^ Thanks again guys!!!

After looking at all this I think I will stay with my original plain and stay focus on the easier modifications.

[Frank Lee]

Originally Posted by 2000mc

nope, didnt, looked like re hashed version of

http://www.ethanol.org/pdf/contentmg...yStudy_001.pdf

Well... it usually helps some to look at something before you comment on it??? Not only did you blow my link off, you evidently failed to take the time to comprehend the material in YOUR links! (BTW- good finds! )

The studies mirror my experience with the stuff.

It is very safe to say that:

1) claims of fe reduction 1:1 with BTU content are false

2) one should not automatically assume that the presence of ethanol will lower fe

3) non flex-fuel vehicles can function quite well on far higher ethanol blends than E10.

Now what is all that about the Chevy? I didn't see any "excitement" about it.

[2000mc]

#1 and #2 are very similar

#1 if you take out the flex fuel chevy from the report( i'll explain why i have a problem with that vehicles results) the general trend tends to follow the mpg:btu expected mileage, the non flex fuel chevy barely deviates from it

#2 true, but looking at the other vehicles the toyota and ford, they achieved thier best mileage with e30, why that mixture? why not e10, e20 and e40? what is the scientific cause? running lean? if it does hold up, is each vehicle different?

#3 absolutely yes, but i thought the reason for e10 and not more was because of the corrosive nature of the fuel, and that in time various components of your fuel system would fail one after another.

i thought the 15% improvement was suppose to be the excitement.

the flex fuel chevy had the most significant result of +15%. the next most significant result was only +1%. i took issue with the chevy result because the manner that the flex fuel chevy is tested, because it would not be able to correctly learn the fuel content. causing how the chevy ran to be a crap shoot, too rich, too lean, incorrect timing, drivability issues.

i figure if you got a considerable mileage increase from running lean, it would probably show up in emissions...

last line of page 7 from http://www.ethanol.org/pdf/contentmg...inal_12507.pdf

The flex-fuel Chevrolet Impala exceeded the NMOG standard for the FTP-75 on E20 and Tier 2 gasoline.

regflag, what? failed emmisions on straight gas? combine that with the fact that the nonflex fuel chevy had better mileage on straight gas, and i would guess that the flexfuel chevy ran rich on the straight gas and lean on e20. with the straight gas as the baseline figure for comparision, that then gives a bump to all the other ethanol mixtures on the flexfuel chevy.