Is 5.3 fuel mileage really this bad?

[DirtyAndy]

My 2020 AT4 with 41k+ miles has a lifetime average of ~17.6mpg with several thousand of those miles having a trailer with my Can Am X3 on it. I dip to about 12-13mpg when towing and with just the truck, I'll get 19-22 in the warmer months. About 18 during the winter at best. My commute is about 30 minutes and is where I generally get 20mpg average.

 

Stock 20" wheels and OEM Bridgestone tires. Only thing added was a S&B CAI and it had little to no effect on my MPG, I just wanted to hear the engine without adding an obnoxious exhaust.

[dgstarr63]

2021 Silverado LTZ71, 5.3, 8 sp, 3.23, 4WD, Stock 18" wheels and tires. City mileage short trips 12 mpg, long trips in city 14-16 mpg. Highway - 22mpg at 60mph. Are sure your odometer is accurate after your modifications?

[Mgyselinckjr]

2021 Silverado Z71

3.23 rear end

MQE 8 speed auto

5.3 V8 

ZERO ACTIVE FUEL MANAGEMENT 

 

I think I broke a record…