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Old 12-25-2012, 11:47 AM   #2
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Originally Posted by Bolto View Post
After driving a loaner Focus S with 15" or 16" (I'm not sure which it was) and getting 2-3 mpg more than what I normally get with my Titanium with the handling pack, I've decided that getting lighter wheels could have a significant impact on my fuel economy.
Basically figure 5 1/2 lbs off your car's effective rolling weight for every pound you remove from a wheel. So by dropping 7 lbs or so with each lightweight 18" over stock, it would be like removing ~40 lbs from the car.

You might want to just dump your 16" spare for a couple of weeks and see what difference that makes first.

Originally Posted by Bolto View Post
One thing I noticed is that the Sparcos are 18x7.5 and the Andros are 18x8, but they both have the same recommended tire width, 215. So does this means that if I kept my current 18" titanium pack wheels, I could switch to 215 tires from the 235 Michelin PS3s?
Possibly, but check load ratings since you'll likely be going to something with less air volume.

Originally Posted by Bolto View Post
Finally, would going from 18" wheels with 235/40 tires to 17" wheels with 215/50 tires mess up my odometer? If so, is there any way around that? Thanks in advance!
There shouldn't be a noticeable effect, a couple of percent difference at worst case.

Last edited by jsr72; 12-25-2012 at 02:13 PM.
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