flex fuel?

I was wondering if anyone knew anything about flex fuel conversions for newer cavaliers. I had an o2 sensor acting up and when i went to advanced auto parts, the guy there said something about my 2003 might need the more expensive sensor for gas and ethenol. but the gm website says nothing about the cavalier. They are building a E85 station near me and it would be worth at least checking out if it can be converted. I think it would need a new cpu, o2 sensors, and probably spark plugs, just from what i saw on cnn about how flex fuel vehicles work. So, anyone know anything about this? Cause i don't know much.

i know they dont make cavaliers with the "flexible fuel valve" and i doubt you can buy a conversion kit, even if there was a kit available you'd spend more on that kit then you would on gas for a year probably, i mean, you drive a cavalier, your gas milage cant be that bad