My Avalanche has the Z VIN# but nowhere else in the truck does it refer to it being FLEX FUEL. I really don't care for it being or taking flex fuel, I bought it from the original owner who only drove to about 65K miles so nothing major was done to it. Is there another way to confirm that it...
I just want to see how many of us 2007 newer 5.3L Flex owners Still run the E85 Flex fuel or not, and hears why.
Last year when I had my 07 at the Dealer for repairs, they told me not to run Flex fuel because it was bad for the engine even though the engine was designed and built to run E85...