Whistlingwings

How do you know on the Sierra if you’re getting the 8 or 10 speed? (In the 5.3)

Looking at getting a crew cab Elevation in the standard box with the 5.3. I test drove this truck and it seemed like for a full size pickup, I was getting around 14-15 city and 18-21 freeway. Granted, this was only a 30 minute test drive in a brand new, non broken in motor. I’d be happy with those numbers...is this typical for this motor? I’m also debating the new ram 1500 crew cab big horn. How does this 5.3 compare to the 5.7 hemi ram as far as mpg and reliability/drivability? I haven’t test driven the ram yet but from stories I hear, some people are avg 13 mpg on the ram while others are up to 19 combined???

How’s the 3.0 diesel as far as longevity with city driving and as a daily driver in a city environment? Better than the ecodiesel?