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Hello all, I have a 2019 Chevy Silverado LT Z71 4x4, Crew Cab, short bed truck. I live in Michigan and my family is taking a trip to Florida this upcoming summer, and it'll be approximately 1,200 miles each way, there and back. For safety reasons, we are considering driving my truck, but I have some questions about the fuel economy. I don't do a lot of expressway driving, but when I do, I typically drive 75 MPH.

Has anyone taken a similar trip, or drive expressways a lot, and know what kind of MPG's you get with that type of driving? What have you found is an optimal speed on expressways to optimize your MPG?
 

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I often have found that driving around 70mph was decent for time and mileage in my vehicle on a highway. It can vary depending on how your truck is geared though. If you can get behind another vehicle thats going the same speed as you, sometimes that helps too since your not pushing through air as hard because you are essentially "drafting" off another vehicle. I don't mean tailgating someone else but keeping a reasonable distance. Of course other things to help would be to make sure your tire pressure is set correctly and that your air filter is clean/new before leaving.
 

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The GM trucks with a 5.3 and a 3:42 rear will get around 20mpg at 70 mph.
As @Crispyt suggest, air up the tires a little, I run 35psi (cold) when driving any distance (33psi in the rear if back is empty).

EDIT:
That's assuming you have factory spec tires, off road tires will kill your mileage.
 

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I get 20-21 mpg on straight expressway driving on my 2018 Suburban 4WD with 5.3L and 3.42 rear.
75 mph. Georgia to Houston, TX.
4 passengers with full luggage compartment.
18-inch road tires at 35 psi.
Cruise control on flats. Disengage on uphill.
 

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I find after 70mph the mpg starts taking a hit. I know the truck will cruise all day long at 75 - 80mph-but that's not an economical speed.
 

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Open the glove compartment and check your build code sticker. If yours has GU6, then it has 3.42 like mine. Mines a 5.3 motor.

In the year I've owned my 14 double cab medium bed, I've driven Boston to Virginia Beach and back. Boston to Prince Edward Island and back, and then down to Kissimmee Florida and back. Once this COVID issue blows over, I plan on driving Boston to Yellowstone and back.

I set the cruise to about 65 or 70 and can get 20-21 mpg out of it on the highway for sure. Watch that fuel economy guage and you can get more but you'll find yourself moving awfully slow. I've put that green meter at 24mpg rated over a 400 mile stretch. I did that with me and the little lady and the dog, with a crossbox diamond deck toolbox full of tools and our luggage in the back.

Mine will easily cruise along nicely at 70-80 but wont get that kind of economy doing so.

Obviously better if you have highway tires instead of all terrains or off road tires. Right now my sneakers are Yokohama geolandar ht on 18 inch rims. I just put on a Leer truck cap. Dont know how that will affect fuel economy. I could see it dropping due to added weight, or not, due to supposed better aerodynamics
 
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