I have had only experiences with GM vehicles in general. I can confirm what others are reporting here, even without a conversion, they respond very well to using blended ethanol. I was able to go up as high as a bit above 50%, but found that the gas mileage was best when using around 35%.
This (blending) is obviously not an issue with a conversion.
Luckily conversions are out there. Car manufacturers are not interested in FlexFuel vehicles. The oil industry is huge, imagine what would happen if you go green like Brazil.