Speedometer/Vehicle Speed Sensor Low Reading

[Loaf]

are you running stock Size tires? (I'm running a 185/70 Series Tire, and my Speedo is off about 3MPH because of it) another reason it might be off is the actual stepper motor that runs the speedometer might be giving up because of being driven by the bad VSS for so long. (also, do you have a sedan or hatch?)

Stock wheels and tires. I'd have to have monster truck tires to make my speedometer be off by 30 mph, haha. I doubt it's the stepper motor because I changed the VSS within a couple of days of the problem starting (unless both malfunctioned during the same trip), but that is worth looking into. Car is the sedan version.