I don't think you got what I was getting at. Would the EPA numbers go down if you could option out a larger tank? They don't for Ram or Ford, because they don't test every variation of ever model. They could easily offer a larger tank as an option and it would have no effect on the rating. They already offer 3 sizes and could have covered all their bases with 2-3 sizes. There is no excuse for GM on this.
I don't tow a ton, so it's not a make it or break it option for me, but will be for others. I'd rather they sell more trucks so they can spend more on updates or new trucks. I can gaurentee with their poor decision making the 2019 model will never take the #1 spot. It's a shame because they made a great truck and shot their own foot with a bunch of stupid easily fixed mistakes.