Yes the true Flex Fuel cars are actually Flex Fuel. Imagine that. 
The flex fuel mod for the evos on stock ECU are currently being worked on for evo 8 and 9.
Alot of us use the GM Flex Fuel sensors to measure the % of eth in our E85. Currently it only does that.
Some of the new Flex Fuel cars don't even have a Eth sensor, they do it off 02 sensor trim feedback.
The flex fuel mod for the evos on stock ECU are currently being worked on for evo 8 and 9.
Alot of us use the GM Flex Fuel sensors to measure the % of eth in our E85. Currently it only does that.
Some of the new Flex Fuel cars don't even have a Eth sensor, they do it off 02 sensor trim feedback.