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I have an 03 Z71 Tahoe with Z engine as well. I ran E85 through it about 5 years ago it was 3 tanks worth. The engine ran smoother, had more power, but fuel mileage dropped from 16-17 combined to 8-9 combined on the first tank, the second was better but was only 11 mpg, and the third was 12mpg...

I have an 03 Z71 Tahoe with the 5.3L flex fuel and intermittently it has low power as well as constant intermittent miss at idle that is not bad enough to set the code but bad enough to notice. I know from the scanner that it is the number 8 cylinder that is constantly missing and occasionally...