2004 toyota sienna odometer based on 17" wheels

[wood]

I have a 2004 Sienna that has 16" wheels but I suspect the odometer\computer is based on the vehicle having 17" wheels[one of the options at time of purchase]. I suspect this because whenever we go past speed indicator signs our speed[on car speedometer] is consistently approx. 5% off [sign says 50mph, car speedometer says 55mph] also based on checking speed[60mph] with 1/10th mile markers on freeway. If our odometer reads 92,000 miles what should it read if it was programed correctly?[/b]

[Google]