Around here if you leave a vehicle idling it's possible it'll be gone when you come out of the store, hahaI fill up as much as my wife’s Tahoe, we both get roughly the same mileage. Take in mind I idle my truck allot, if we stop for gas, food or just run in a store it’s running. on a trip I usually don’t shut it off unless I’m in a place for an hour or so. May sound odd, but after being a police officer for almost 20 years it’s a habit that’s hard to break.
If maintained, I don't see why 300k+ would be unexpected. I've really not come across many negative comments regarding the 6.4 (some lifter/exhaust tick when cold, diff from 5.7). 6 speed life is probably more questionable vs. the ZF. As to what the interior will be like, switchgear/plastics/fabrics. Gen4 will be better than gen3.Anyone know what is considered high miles for these trucks? I have 183 on my Tundra, and several friends have nearly 300K on theirs without issues, but I’m not sure what to expect with a Ram.