New to Ram, and love the 21 I just bought. The truck just feels great. Interior is superb, it's quiet, rides wonderfully and really meets my expectations.
I will say I'm initially disappointed in the fuel economy. Last three vehicles were GMC Sierra (08, 14, 17) crew cab 6.5' bed pickups, and they got better each iteration until my last (17) with the 6.2L that was seeing MPGs in the low 20s using cruise control on highway trips. Sweet.
Now, I'm still on my first tank of gas (and thank goodness for the 33gal tank- why doesn't GM do this on half tons??)... so, it's anybody's guess what fuel the dealer put in from the get-go. But so far I've reset the fuel economy tracker twice after doing some more idling than usual while setting up systems, etc. Best I've seen with my normal driving is 17mpg. Ok. Worst is 13mpg. On stock junky tires! Damn.
Next I'm putting on real tires (BFG KO2 285/65; ~2" larger diameter) and anticipate a drop in MPGs, but get that is inherent with a larger tire. I want them to fill the wheel wells better and give me a little better clearance. No prob to see 1-2mpg loss in exchange.
Data points: 2017 GMC had a lifetime fuel economy (35k mi) of 18mpg. That included remote starts on cold mornings, quick accelerations, passing people at the speed limiter, etc. Heaviest thing I tow is a 500lb trailer.
If this half ton gasser can't come close to that, I might as well buy one of the new V6 turbo hybrid engine rigs from Toyota or Ford. But then I'd be driving a Toyota or Ford... so maybe not!