Wow.. so according to their websites, the following vehicles are available as FlexFuel:

* GMC Sierra full-size truck
* Chevy Avalanche full-size truck
* Chevy Monte Carlo mid-size sedan
* Chevy Tahoe full-size SUV
* Chevy Silverado full-size truck
* Chevy Suburban extra-full size SUV
* Chevy Impala mid-size sedan
* GMC Yukon full-size SUV
* GMC Yukon XL extra-full size SUV

So other than the Impala twins (the Monte Carlo is just a 2-door Impala) it's nothing but their monster trucks and SUV's. Way to send mixed messages.