I ordered an ETorque 22 Laramie with the 6 foot bed. Been driving it for about 3000 miles now. It does have the 33 gallon tank, I can verify that you can get one with ET..
I don't think it makes a ton of difference, but I don't have much to compare it too. Towing a trailer I did feel like i had good out of the hole torque; which is good because the Hemi is a pretty rappy motor (torque peak is in the 4000 range). I do think the start stop is pretty sophisticated. I turn it off on most cars, I haven't touched it on this one.
I did think about getting it on my truck for all the reasons discussed above. IN fact, the reason I got a Ram in the first place was I didn't trust the ford platform of 6 cylinders, 2 turbos, 12 injectors and potentially a hybrid battery and motor. Too much BS to go wrong. Just give me a pushrod V8 and call it a day. None of us are winning races with 3 ton vehicles anyway.
The reasons I did like the system were the off line torque was some of the things it is designed to do. I like the idea of rev matching the motor up and down, in theory this should save a good deal of wear and tear on the trans. I like the idea of regenerative braking too, saves wear and tear on my pads and rotors. Also, with the 48v battery pack, I saw a guy from the wrangler forums who had converted his into a poor-man's generator to power things in his truck (almost like the ford powerboost does, but to a lesser degree). He says it works great for that purpose and it was easy to do.
So for me it was a little bit about the mileage, but more about the other functions of the system.