In the pre-digital days I had a 92 BMW that seemed to have the reverse "problem" - pushing "up" or "down" on the cruise control settings wouldn't move you up or down a whole mile per hour, but seemed to operate in KMH - it would move something like 0.6 or 0.7 miles. (There was no direct digital readout, but it had a "average speed" trip computer that I remember resetting after some changes after noticing it seemed to move less than 1mph on the speedometer.)
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In the pre-digital days I had a 92 BMW that seemed to have the reverse "problem" - pushing "up" or "down" on the cruise control settings wouldn't move you up or down a whole mile per hour, but seemed to operate in KMH - it would move something like 0.6 or 0.7 miles. (There was no direct digital readout, but it had a "average speed" trip computer that I remember resetting after some changes after noticing it seemed to move less than 1mph on the speedometer.)