Mileage on bigger tires

[Andrew2015]

Looking on upgrading off my stock tires on my 2015 silervado 1500, running 265/65/R18 right now and looking to level it and jump to a 33” tall tire with a 20 inch wheel, curious on what kind of mileage I’d be getting? And any recommended specific sizes

[19trax95]

When I was just leveled with a 285/65r18, I averaged 14-15 around town and to work, which is mostly back roads with only a couple stops. Then highway doing 70 I averaged 19-20.

 

That was tuned by Lew and running 93.

 

I'm now lifted 4.5" and running the same tires and my around town average is the same but highway dropped to 18 or so.

 

That's all hand calculated. The dic shows 1-2mpg better than what I actually get. Highway it comes close though.

 

A true 33 will be obviously taller than what I run. And depending on tire also heavier.

 

Edit: I have 3.42 gears, so if you have a different ratio, basically none of my numbers would be relatable

[zach1990]

I'm running a 14 crew cab 4x4 with the 5.3. Leveled, 18x10s, and 275/70 all terrains. I get on average 18.5 hwy unloaded and 11 towing.Thats also with the diablo predator, K&N intake, and magnaflow exhaust.

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[Druder]

I went to 265/70r18 and at first I only lost 1-1.5 and hovered around 18 but after 1000 miles I'm lucky to get 16. I despised the stock tires but I'm very torn on running a highway tire during summer and making these winter wheels.

[HondaHawkGT]

I get 22 MPG at 60 MPH with cruise on and minimal hills. The best I've ever done over a 400 mile average is 23 MPG. Typically 20-21 MPG at 65 to 70 MPH average with slight elevation changes. The main reason I do so well is thanks to these god forsaken 3.08 gears.

[lryfer]

so i am thinking of going from stock 17" to 18 wheels. so i will lose MPG if i do this? I have been told going from 17 to 18 tire gets worse MPG because it takes more to push the 18".

 

What say you folks of knowledge.