Ah, I didn't know they could be calibrated separately... anyway, I think they both need some tuning. (trucks are blowing by me and my commute is ''longer''! :))
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Maybe its Nissan's way of saying slow down live longer .. and save gas
This may sound crazy but check the front tire pressure. I had Bruce raise mine to 37 lbs. cold from 35 lbs. from the dealer. I feel the fronts should be more as it has the weight of the running gear and driver (Some times pass.) Made a difference in the Speedo/GPS reading. Speedo is higher now.
Going with more pressure should theoretically make for a slightly larger tire diameter, which would give you more speed and more km's than indicated. I can't really see a few lbs making that much difference though.
I usually run the tire mfg's max pressure, which on my base model car is 40psi.
All of which reminds me that I have not checked the tire pressure yet!
Steel belted radial tires do not balloon with pressure really (I'm sure they move a tiny bit, but its not noticable), the steel belting holds their form and diameter very well. Older bias ply tires certainly did balloon out. Tire pressure shouldn't have an effect on tire diameter / odometer / speed readings.
Yeah, i'm having a hard time with Antruby's claim also. It is very easy to get any tire to ''grow'' with added pressure, it's just that within the acceptable range I doubt there is a noticeable difference, unless it was tracked over many, many kilometres. There might be something else that is influencing her experience...do GPS numbers vary at all?
Hi everyone...i was curious from this posting therefore I had to check it out myself and we did!!! i got my friend to take a picture and scan it through obd II to see the difference, hence you see in the pictures that it is off. I would like to hear from everyone their inputs on this situation.
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GPS can vary quite wildly depending on a few things, namely a clear view of the sky.
On some cars, the ECU takes the reading from the ABS module at each tire and then the average out of the 4. Some cars use a sensor at the transmission. Older jeeps have a gear that spins in the xfer case If I remember right.