New Wheels effect on MPG's

[warriormagee]

I'm looking into changing my stock 17's to 22's on my '07 Yukon XL. Currently I'm averaging 21 mpg's. What kind of hit can I expect with my 22's on low profile tires? Any suggested mods for a stock Yukon to help after the upgrade?


Thanks

 

[HitandRunDriver]

21 mpg... Orly??? what mods are you running at the moment

 

[Zed 71]

Hybrid?

 

[My01yuk]

Got to be a Hybrid!

 

[blueflamed03]

expect less MPG and less brake...

 

[warriormagee]

As stated in the original post, I am completely stock at the moment. It is a 5.3L engine that will accept Flex fuel, though I haven't used any in it since I bought the truck in March. Also, that was 21 MPG highway. I was told by a co-worker that I could prob expect closer to 15 mpg after changing the wheels. Does this sound right? A 6 MPG decrease sounds excessive.

 

[blueflamed03]

I bet it's not 'that' drastic. You could always get a Black Bear tune and get more power, and at least 2 MPG of that back

 

[HitandRunDriver]

Not to bash on you but unless you are driving 100% highway and cruising 60-65 with no a/c I don't see how you are managing such high MPG's. A tire of that size will definitely lower your fuel economy and lower the efficiency of your brakes, but not by 6mpg.

 

[bigblue]

my stock 4.8 got 21mpg stock. Now i got 26s and a Black Bear tune and get 18mpg...but most of my driving is on the interstate at 75mph. Its not going to kill your gas mileage thats bad, maybe 2 or 3 MPG loss even without the tune. I didnt really notice much increase in mpg with the tune. maybe 1mpg better with it.

 

[Eagle]

Not to bash on you but unless you are driving 100% highway and cruising 60-65 with no a/c I don't see how you are managing such high MPG's. A tire of that size will definitely lower your fuel economy and lower the efficiency of your brakes, but not by 6mpg.

I got a ~3 mpg (corrected) jump when I ditched the 22s for OEM 20s (275). the PO's 22s had slightly over tall tires at 305/45, instead of 305/40. ON the obc it did look like 5-6.

Since you are only on 17s, i'd expect a 4 mpg drop especially when not steady speed flatland driving.