Around here all but 2 gas stations have E10. I've filled up with both and checked a/f and gas mileage... since i've put my intake on i've noticed that the car will get up to 5* of KR and just feels down on power. Last night intake temps were in the 70's and no crazy humidity and the car had 3-5* of KR during a third gear pull. i really dont believe this car compensates for the e10 as it should. am i wrong to think this? should i try throwing some of the NOS octane booster in(big bottle that actually does bump it like 2pts) or try mixing in 2 or 3 gallons of 110?

 

Most of the midrange & high load KR is related to fuel trims, E10 or straight 93. Forget the octane booster, try some 110 if you want. Even with 50% E which pushes the octane up several points I can see some midrange KR 2-3* on #4 at times, none WOT at 23* advance though.

Just because two stations don't list it as E10 doesn't mean it isn't. Most states don't require it to be labeled at the pump.

EDIT: SC does it seems. http://www.fuel-testers.com/state_gu...anol_laws.html

 

well around here the e10 is rated for a higher octane on the pump
the gas stations with e10 have 90 92 94 the rest are 87 89 91, so if your getting 93e10, thats not different than running 93 regular from a knock resistance p.o.v. atleast that what it seems like to me, but i could be wrong.

 

The 93 octane E-10 we have in Florida used to have no ethnol in it about 2 years ago. I used to be able to run 1-2* more timing with no knock so the knock resistance of E-10 93 octane is not as good as straight 93 octane gas according to my testing. 93 octane E-10 should have a little more knock resistance than 91 octane.

 

i know for a fact that there is ethanol in all of them, supposedly Shell 93 is the best E10 to get for consistancy and the two gas stations i was speaking of specifically advertise "pure gas, no ethanol" i could tell a pretty big difference when i was logging my mustang and gas mileage was always crappier with E10 as i expected... with my cobalt its no different.

btw my RPD showed a max of about 230hp last night spiked ~275tq then settled at 255-260. pressure always seems to be about 28.9 where i live.

 

The percentage of 'up to 10% E' varies greatly, most around here is around 5-5.5%. It is splash blended into the tankers at the terminal off the pipeline or at the refinery, the percentage is only as good as the loader tech.

In Indiana if it is labeled at all (no requirement) it will say 'Contains up to 10% Ethanol' We're in a large metro region so the EPA gas here all has some E in it.

I'd say it's a stretch to notice mileage drop on a 10% blend more than a few tenths MPG as mine on E10 was 30.4, E-48 is 27.2 and E85 was 25 with my highway commute. YMMV...literally.

 

i got 16-17.5 on E10 and 19-20 on Pure gas with my mustang driving it back and forth to work. everyone i've talked to locally has noticed similar drops in gas mileage. My buddy had a stock shortblock LS1 GTO w/ ported heads and stock GTO LS1 cam that banged down 430whp and got 30mpg when driven right back and forth to charlotte on pure gas, with E10 it got about 26-27.

it just bothers me that the stock wideband doesnt show anything differnt when e10 is introduced...

with that said, i made a 2nd gear pull at lunch getting on the highway and only saw 1* of KR randomly and its currently 80*...

 

Ya the E10 variances **** me off with the gas around me as well...

I need all the timing I can get on the TVS, so having such big differences is really bothersome. Sometimes I have to take several degrees of timing out of the tune.

 

The wideband 02 sensor only knows Lambda, it doesn't care where the excess 02 comes from, that's how I can tune the MAF freq to compensate for the LTFT shift. E10 should drive your fuel trims positive compared to pure gasoline. Lambda is 1.0 for stoich regardless of the fuel burned.

50% E drives them +14%, E85 about 27%. The difference in the stoich values is what causes the shift. It runs richer to compensate for that oxygen atom in there. (C2H5OH)

 

Sinclair .My car is just nasty after using it . Other wise I use Shells Nitrogen enriched stuff.

Keeps the fuel colder it seems?

 

oh heck i was getting knock on 91, and started using 94 with 10% ethonal (is what im guessing e10 is) and my knock went away totoally and i got more top end.