Oem 17 inch wheels vs oem 20'S

[ROGELIO A GUZMAN]

Hey fellas. I know that the 20s are way heavier. Most of you guys have swapped from oem 17 to 20s. Did the mpg changed. I like the 20s look but for long trips, maybe I can swap back on the oem 17s . Did any one notice a big difference. I'm planning a 1500 mile trip. If I can gain some mpgs I wouldn't mind it. Thank you in advance.

 

[adventurenali92]

Depends on the type and size of tire you go with. When I first swapped to 20s I stuck to OEM size and Michelin LTX tires. Miles per gallon stayed the same. But I wasn’t thrilled with the ride. While it wasn’t bad I wanted it better so I went with a taller, slightly more aggressive tread pattern. It only changed slightly with that last size.
If you’re that worried about fuel economy on a near three ton SUV with a large V8, I’d stay stick to your factory 17 inch wheels and the factory recommended size tire for your rig.

 

[drakon543]

as stated above your losing sidewall going up to a 20 so less tire to cushion the road. however just because you drive a land yacht doesn't mean you cant think about not having a big impact on your mpg. anyway sticking with a stock tire size even if your going up in rim size wont have much of an impact aside from ride quality.

 

[ROGELIO A GUZMAN]

That's what I kinda figured. My 20s have the same height as my stock 17 with oem tires. Just wanted to get you guys feed back. I will be traveling to the south ,and roads aren't that great. So I might just swap to my 17s for ride comfort and just in case I hit a huge hole in the road. The oem tall tire should ride a whole lot smoother.

 

[Joseph Garcia]

I can't help you with your question regarding mpg versus rim size differences. What I can tell you is that for tires, I went from a 275/60x20 tire to a 305/50x20 tire, and I did not notice any change in mpg.

My belief is that 'how' you drive the truck will make a greater difference in mpg, than the size of the rim or the tire. For example, when I drive on the highway, I get between 14 - 16 mpg, but when I drive on the highway with my wife (who has NO tolerance at all for aggressive driving), I get 18 mpg. That being said, with the 6.2L motor, it is simply too much fun to drive aggressively, than to back off and strive for greater mpg.

 

[S33k3r]

Remember that if you go with a diameter different than factory original, your speedometer and odometer will be off. Many people forget to calculate that in their MPG calculations. Also, here is a convenient table for your tire-sizing pleasure:View attachment 272364

 

[Joseph Garcia]

Remember that if you go with a diameter different than factory original, your speedometer and odometer will be off. Many people forget to calculate that in their MPG calculations. Also, here is a convenient table for your tire-sizing pleasure:View attachment 272364

Very true.

And, for those folks whose mods in rim/tire combinations end up with a different overall tire diameter than stock, this is yet another justification for a tune, in order to eliminate this discrepancy.