It will feel the same as the 19's with 3.55's. The gear/tire size ratios cancel each other out.

 

Have you verified a difference in true tire diameters?

 

agreed i thought they just used a narrower sidewall to maintain the same overall diameter.

 

Couldn't be bothered to check it now, but pretty sure the rears are indeed a taller tire so the 3.73's end up being the same as the 3.55's. Besides, it would look awfully strange to have a narrower sidewall on the rear than on the front.

 

I don't recall if we discussed this before, but, what's the point of the 20" in the rear vs. 19"s all around? I assume thre has to be a reason? And logic would dictate it'd be a very good reason as same rim all around would have been cheaper on Ford to supply. Thought's of getting two 19's and putting them on the rear have crossed my mind... Then the 3.73's would show through! I could also dump 4.10's in there.

 

OK, I went and did the math.. PP and 285 / 35R20 vs std on 285/35R19

19" tire height = 285 x 35% = 99.75MM x 2 = 199.5MM = 7.85in + rim = 26.85in
20" tire height = 285 x 35% = 99.75MM x 2 = 199.5MM = 7.85in + rim = 27.85in

Now to factor rollout

tire height X Pi / Gear
19" = 26.85 X 3.1416 / 3.55 = 23.76
20" = 27.85 X 3.1416 / 3.73 = 23.46

Where a lower rollout would imply faster acceleration, the 20" is only marginally faster with the 3.73.
For reference
19" = 26.85 X 3.1416 / 3.73 = 22.61

For fun, here's the result of a 4.10 in the PP car
20" = 27.85 X 3.1416 / 4.10 = 21.34

 

interesting data, which begs the question why did they put the 20s on the rear??

 

The spoiler is functional, not just aesthetic. Its shape provides downforce that significantly improves the handling of the car. Spoiler delete option would not be a good thing...

 

I agree about the Kona Blue needing Stripes. I think Blue Mustangs and white stripes go together like Ray Allen and the 3-pt stripe.

 

don't buy a 2010, as the 2011 is a much better car. The 2011 will cost more but it is a better car.