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Can you find a nearby section of freeway with odometer calibration markings? They have several near me in Washington, not sure how common they are elsewhere. But, you can compare your odometer to a 5 mile long section of road that is marked at precise, 1 mile increments. Use that to determine what percentage your odometer is off (which may or may not reflect the error in your speedometer).
Assuming the 60 actual miles = 65 miles indicated, you would need to multiply your indicated miles by (60/65) or .92
300 x (60/65) = 277 actual.
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