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Hat man,
What brand/model of tires did you buy? What was the original equipment tire size which should be on your door pillar? I have found that actual tire diameters can vary significantly than the theoretical measurements that the online calculators use. I would suggest looking up the actual diameter of the OE recommended tires and the actual diameter of your new tires.
For an example, if the OE tire size was P215/70R14 which in a BFG tire would be 25.9" and 803 Rev/Mile and you went to 821 BFG Long Trail T/A Tour 27.7" and 751 Rev/Mile, then your odometer would be off by 6.9% (803/751=1.06924). This means for every one mile on the odometer, you actually traveled 1.069 miles.
As for your speedometer you could divide by 1.069 to get your actual speed, aka 51.5 MPH on the dash means 55MPH in real life. However the speedometer may have been off from the factory so I would suggest though that you borrow a gps and figure out what speed on the dash equates your desired cruising speed.
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