GMC 5.3 or 6.2 Liter Engine?

Taco wrote:
Either engine will do the job just fine and by just fine I mean it will get there and do so at a reasonable speed.

The new 5.3 seems to have similar numbers to the 6.0 that is in the 2500hd but you can't get the 3.73 or 4.10 rear ratios the 2500 has. I am thinking the 5.3 will end up towing in 4th gear at 2600 rpm @60mph on the flats. The 6.2 might pull in 5th. If the price wasn't too big of a difference and factor in if it needs premium fuel I think I might consider the 6.2.

Here are the specs on all GM Truck Gas Engines from the GMC website:
http://tinyurl.com/km52apk

SPECIFICATIONS - SIERRA 1500 DOUBLE CAB

Engines EcoTec3 4.3L V6 FlexFuel
(LV3) EcoTec3 5.3L V8 FlexFuel
(L83) EcoTec3 6.2L V8 FlexFuel
(L86)
Type: 4.3L V6 5.3L V8 6.2L V8
Displacement (cc / cu in): 4300 / 262 5328 / 325 6162 / 376
Bore & stroke (mm / in): 99.6 x 92 / 3.92 x 3.62 96 x 92 / 3.78 x 3.62 103.25 x 92 / 4.06 x 3.62
Block material: Cast aluminum Cast aluminum Cast aluminum
Cylinder head material: Cast aluminum Cast aluminum Cast aluminum
Valvetrain: Overhead valve, two valves per cylinder, variable valve timing Overhead valve, two valves per cylinder, variable valve timing Overhead valve, two valves per cylinder, variable valve timing
Ignition system: Coil near plug, platinum-tipped spark plugs, low-resistance spark plug wires Coil near plug, platinum-tipped spark plugs, low-resistance spark plug wires Coil near plug, platinum-tipped spark plugs, low-resistance spark plug wires
Fuel delivery: Direct fuel injection with Active Fuel Management Direct fuel injection with Active Fuel Management Direct fuel injection with Active Fuel Management
Compression ratio: 11.0:1 11.0:1 11.5:1
Horsepower (hp / kW @ rpm): 285 / 212 @ 5300 (gas)
297 / 221 @ 5300 (E85) 355 / 250 @ 5600 (gas)
380 / 283 @ 5600 (E85) 420 / 313 @ 5600 (est.)
Torque (lb-ft / Nm @ rpm): 305 / 413 @ 3900 (gas)
330 / 447 @ 3900 (E85) 383 / 519 @ 4100 (gas)
416 / 564 @ 4100 (E85) 450 / 610 @ 4100 (est.)
Recommended fuel: Regular unleaded or E85 Regular unleaded or E85 Regular unleaded or E85
Maximum engine speed (rpm): 5800 5800 6000
Emissions controls: Close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor Close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor Close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor

Estimated fuel consumption for the 6.2 shows as TBD (To Be Determined)
However the Fuel is Regular unleaded or E85.
The Mileage for the 5.3L is
2WD: 22 / 32 / 26
4x4: 21 / 31 / 25

BTW don't know if everyone noticed the price is the same for both engines at least in the SLT Version.

Here is a link to the US Department of Energy website http://www.fueleconomy.gov/feg/bymake/GMC2013.shtml

They show a 2013 GMC Sierra K15 4WD 8 cyl, 6.2 L, Automatic 6-spd, Regular Gas or E85 as giving City 12, Combined 14 & Highway 18
This is a 2013 not 2014 so don't know if it is actually the same engine.

Thanks to all for their comments, appreciate them!.....Ernie