Width doesn't affect the speedometer. The overall diameter of the tire is what affects the speedo. If you look for a wider tire that has the same overall diameter as your stock tire, the speedo should be fine.
2012 Grabber Blue Mustang Convertible V6 Premium
1979 Solar Gold Trans Am
1995 Bright Red Trans Am Convertible
You're tired of spinning gears with your new found power and the solution is to go to a narrower and shorter rear tire........both reducing your contact patch and giving that power more leverage? Not really a solution. The 255/45-18 recommendation above is a good one.
Now...
I am thinking of going from 235/50/18 to 245/45/18. I am getting a good deal on some Cooper RS3-s tires. I know that there is a 2.14% speed variance [too fast]...but i should be ok, correct?
The change from 235/50 to 245/45 shouldn't affect your MPG much. Being 2.1% smaller in dia isn't that bad, and it's only a small difference in speedometer reading. When speedometer reads 60 mph you will actually be going 58 3/4 mph.
Not sure why you're not going with the 255/45 which would only be 1.1% smaller and a wider tire.
I can only assume it's because the good deal you mentioned is on the 245/45.
I'm surprised no one brought up a discussion of a stickier tire.
Good luck!
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