Feel like I'm beating a dead horse, but I am most dissatisfied with fuel and range reporting with my 32 gallon tank.
I specifically purchased a 32 gallon tank on my new truck to extend the range, not increase the size of the "reserve tank". My folks live just far enough away where it is just outside the range of my old RAM truck with the 26 gallon tank, so I bought the 32 gallon so I could get there without having to stop for gas (bathroom is another question). I'm not about to drive out in the middle of nowhere with my truck reporting 0 mile range, and it irritates me that my new truck effectively has same range as the old truck.
By comparison, I regularly run my truck down to 0 miles left, then drive a little more. I typically put 27 gallons in when I fill up. Old truck, I'd drive to single digit range left, and it required 25.X gallons to fill.
I want my truck to report to me the true range and remaining fuel, and to let me decide the fuel margin I want to maintain. I want the extra miles from the larger tank, not a bigger "reserve tank". This makes me grumpy.