I put Michelin Cross Terrain 245/70/R17 on my V-6 becuase the steel on the dunlops was showing through. Anyway, these tires are huge with a larger diameter, but they look nice becuase they take up more of the wheel well. My question is does the increased tire pressure cause any difference in the odometer or speedometer reading? BTW the ride is great, absolutely no vibration and great wet/dry performance, can't report on the snow yet though.
Diablok2
With that tire size, you will be almost exactly spot on for the speedo now. With the old tires, you were about 3 1/2 MPH slower that what the speedo read. The good news is that you ODO will show just a little less than was actually travelled. 
Code:
Spec Sidewall Radius Diam Circ. Revol. Speedo ODO Difference
255/55-17 5.5" 14.0" 28.0" 88.1" 719/mi 60MPH 10000mi N/A
245/70-17 6.8" 15.3" 30.5" 95.8" 661/mi 55MPH 9193mi 8.8%
265/65-17 6.8" 15.3" 30.6" 96.0" 660/mi 55MPH 9176mi 9.0%-
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