Ethanol

[Chevy366]

Is it important to tune in % of , example 90g-10e blend ?
Octane rating takes into effect % of ?
B3660 Open Loop Ethanol Blending >B3647>B3649 .

[Chevy366]

The reason I am asking I know for sure around where I live the Fuel is 90-10 blend .
I looked at a stock tune but B3660 is 0 and there is no difference in the OL Fueling Standard and Ethanol values .

[kbracing96]

A 90-10e blend is close enough that the pcm can easily compensate with the trims. And not affect OL much. It only when you get up to the 15-85e That it needs to compensate.

[Chevy366]

Thanks , what I wanted to know .