Has anyone found a discrepancy on GPS miles vs. odometer miles?
I tested a couple of portable GPS devices against the odometer of my Highlander hybrid and found about 3 to 5 miles difference while driving on the freeway. City driving showed less difference, however. GPS showed less distance traveled. Has Toyota or other manufacturers made any comments bout this or are this unique to my vehicle. The implication over an extended period is faster use of warranty mileage and also depreciation of vehicle based on use. Your speedometer is likely more accurate than your GPS because your GPS has Dilution of Process (GDOP, VDOP and TDOP) factors of likely at least 1 on a standard GPS device. Your speedometer is coupled directly through electronic or mechanical means to your vehicle giving it excellent accuracy readings that would be more accurate than your GPS device.
