I have 31's on my Raider and the difference is about 5mph on the speedo, but what do I add for the odometer to make up the tire size difference? Would I add something like 9%? <img src="/forums/images/graemlins/confused.gif" alt="" />

1987 Dodge Raider rebuilt Quest block bored .040 over put together, and installed by Shelby. 5spd, '87 stock turbo, Intercooled, 2.5" exhaust. MPI with hard pipes, FIP Pro-4, MSextra MS1