should be able to get a rough guess on mileage/use by examining wear on various areas, start with the interior, like rubber pedal pads, seat spring condition, especially driver side, steering wheel wear spots, etc - also look over the suspension and the condition of things under the hood .... if it really only has 841 miles it should look pristine everywhere, with over 100,000 everything will be worn out or have been replaced ... as indicated above, might have broken a speedo cable early on that wasn't repaired, or you might find after driving it awhile that the odometer is no longer registering
Bill