msturtz wrote:
The ECU must be able to dynamically determine the ethanol percentage on the fly and adjust the timing and amount of fuel injected. If isn’t optimized then the fuel economy suffers.
And the "magic" computer shows up again.
Even the most modern vehicles are not able to "determine the ethanol percentage".....on the fly or otherwise.
It can't measure the octane either.
The oxygen sensors in the exhaust can make some tiny adjustments to the mixture but that doesn't imply that it is measuring either the ethanol OR the octane.
The fuel management ECU is not nearly as "smart" as some of you give it credit for.