Quick Answer
Straight-line (haversine) mileage measures direct point-to-point distance. Road-distance mileage follows drivable routes via mapping APIs — typically 15–30% longer and far closer to odometer readings for reimbursement.
Direct answer
Straight-line (haversine) mileage measures direct point-to-point distance. Road-distance mileage follows drivable routes via mapping APIs — typically 15–30% longer and far closer to odometer readings for reimbursement.
Straight-line underpays field reps on real road networks; road-distance engines align with IRS substantiation expectations.
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