Short answer to your question. No.
Long answer below
You are overthinking this whole thing.
For round numbers. Assume your tiger gets 16 mpg. (mine gets 13 city 17 hwy)
You will burn 1600/16 = 100 gallons of gas. At 3.00 per gallon you will use
spend $300 on gas. To save $170 you spend on tires, you would have to increase
your gas mileage to spend only $130 on gas. At $3/gal you could burn 130/3=43
gallons.
1600/43=37 mpg. Do you think a 22.8/22.4= 2% increase in tire diameter is
going to more than double your mpg?
not to mention the diameter change will make your speedo inaccurate and your
gas mileage calc will be in error anyway.
Summary to long answer: No.
If you were really interested in saving gas you would set the cruise at 60mpg
and you would save 10% or more.
If you need tires buy them, otherwise put the top down and enjoy the drive. If
you are worried about expenses rent a Kia and get 35 mpg
---- wsamouce <wsamouce@kc.rr.com> wrote:
> Hey guys,
>
> I am thinking about a bigger rear tire to save me some $$ when driving 1600
> miles to TE/AE United 2010. The Sumitomo's I have (195/60R13) are 22.4 in
> diameter and 935 revs per mile. If I go to the 205/60R13, they are 22.8 in
> diameter and 914 revs per mile. I am trying to figure out if the gas
> savings would offset the $170 cost of the tires with mounting.
>
> I just can't get my head around the math to figure it out. I am currently
> running 3600 RPM at 78 MPH (3.07 gear). I plan on running the same speed,
> with cruise control, all the way to Maine. The larger tire would allow me
> to run at 3535 RPM for the same speed.
>
> TIA!
>
> Duke
> B382002037
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