Ethanol in pump gasoline

greasemonkee · Post by **greasemonkee** » Tue Jul 22, 2008 6:26 pm

From my understanding, it was to phase out MTBE in gasoline - to achieve the octane requirements (and clean burn properties?) and to lighten the national demand of gasoline. Who has it now? I think a sticker on the pump is a requirement indicating the 10% blend. Haven't seen any in NC yet. Question - what will the stoichiometry be if mixed 10% ethanol? Or 20%? Isn't there a formula?

Post by **Bugermass** » Tue Jul 22, 2008 6:43 pm

we have it here in TX at every pump. Still tune for the same AFRs. Stoic is Stoic, the wideband will read it the same.

Almighty-Si · Post by **Almighty-Si** » Tue Jul 22, 2008 7:32 pm

Here in NYC we've had it for years. Used the be 10% now it's 15%. I didn't notice a difference going from the 10% to 15% blend. I haven't tuned since the change the car runs the same, A/F's look the same. I wouldn't worry about it too much. Funny I didn't notice that when I was down in NC in July. I usually notice stuff like that